CN215693116U - CO recovery by using ship tail gas waste heat2Of (2) a - Google Patents
CO recovery by using ship tail gas waste heat2Of (2) a Download PDFInfo
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- CN215693116U CN215693116U CN202121976371.5U CN202121976371U CN215693116U CN 215693116 U CN215693116 U CN 215693116U CN 202121976371 U CN202121976371 U CN 202121976371U CN 215693116 U CN215693116 U CN 215693116U
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Abstract
The application discloses utilize boats and ships tail gas waste heat recovery CO2The system relates to the technical field of ship tail gas. The application provides an utilize boats and ships tail gas waste heat recovery CO2The system comprises a tail gas pipeline with an inlet end and an outlet end, a regeneration tower and an absorption tower are sequentially arranged between the inlet end and the outlet end, the inlet end is used for being communicated with ship tail gas, and CO is arranged in the absorption tower2Absorbent, CO in marine exhaust2Is absorbed in the absorption tower and is fed byDischarging at an outlet end; lean in CO2The first end of the absorbent pipeline is communicated with the regeneration tower, and the second end of the absorbent pipeline is communicated with the absorption tower; rich in CO2The first end of the absorbent pipeline is communicated with the regeneration tower, and the second end of the absorbent pipeline is communicated with the absorption tower; the drive assembly is arranged at lean CO2Absorbent pipeline and/or rich in CO2On the absorbent line, is CO2The absorbent provides the driving force for the CO2The absorbent circulates between the absorption tower and the regeneration tower. The application is used for recovering and utilizing CO in ship tail gas2。
Description
Technical Field
The application relates to the technical field of ship tail gas, in particular to a method for recycling CO by utilizing waste heat of ship tail gas2The system of (1).
Background
With the increasing level of human production, the environmental problems caused by the increasing level of human production, such as global warming caused by excessive carbon emission, have attracted a great deal of attention from all circles. According to the related estimation, CO in the air after the industrial revolution2The concentration of (A) has been kept at a relatively rapid rate of increase, approximately before the industrial revolution of CO2The concentration is 2-3 times, and if the concentration is 2-3 times, the sea level will rise, the species will be extinct, and many results are hard to imagine.
Combustion of fossil fuels is responsible for CO2The main reasons for the emission are that various equipments in human production and life, especially transportation vehicles, such as automobiles and ships, burn a large amount of petroleum and products thereof every year, and emit a large amount of CO into the atmosphere2Greenhouse gases, causing global averagingThe temperature is continuously rising.
From the current process technology, CO of automobiles2The emission is already alleviated along with the vigorous popularization of new energy vehicles, and CO of a power plant2Emissions have also achieved preliminary success due to the introduction of carbon dioxide capture and sequestration (CCS) technology, however, the realization of CO is desirable in such a confined space as a ship2The recovery and the utilization of the waste water have great technical difficulty. In fact, CO2And the ecological water-based fertilizer is also an important resource of an ecological system, and if the ecological water-based fertilizer can be recycled and utilized, the environmental problem can be solved, and the mankind can be benefited. Therefore, a low-energy-consumption and high-efficiency shipborne CO is developed2The technical scheme of recovery and utilization has great significance for environmental protection and economic benefit.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a utilize boats and ships tail gas waste heat recovery CO2For solving CO onboard a ship2The problem of difficulty in recovery and utilization.
In order to achieve the purpose, the application provides a method for recovering CO by using waste heat of ship tail gas2The system comprises: the tail gas pipeline is provided with an inlet end and an outlet end, a regeneration tower and an absorption tower are sequentially arranged between the inlet end and the outlet end, the inlet end is used for being communicated with ship tail gas, and CO is arranged in the absorption tower2Absorbent, CO in said marine exhaust gas2Absorbed in the absorption tower and discharged from the outlet end; lean in CO2An absorbent line, the CO lean2A first end of an absorbent line is in communication with the regeneration tower, the lean CO2The second end of the absorbent pipeline is communicated with the absorption tower; rich in CO2An absorbent line, said CO-rich2A first end of the absorbent line is in communication with the regeneration column, the CO-rich stream2The second end of the absorbent pipeline is communicated with the absorption tower; a drive assembly disposed at the lean CO2Absorbent line and/or said CO rich2On the absorbent line, is CO2The absorbent provides the driving force for the CO2The absorbent circulates between the absorption tower and the regeneration tower.
In some embodiments of the present application, the recovery of CO using waste heat from ship exhaust gas2The system of (1) further comprising: and the washing impurity removal tower is arranged on the tail gas pipeline and is positioned between the regeneration tower and the absorption tower, a water inlet and a spraying device communicated with the water inlet are arranged on the washing impurity removal tower, and the water inlet is used for accessing washing water and is sprayed to the inside of the washing impurity removal tower by the spraying device.
In some embodiments of this application, the bottom of washing edulcoration tower is equipped with outlet and air inlet, the water inlet with the top intercommunication of washing edulcoration tower, spray set is located the top of washing edulcoration tower, the top of washing edulcoration tower still is equipped with the gas outlet.
In some embodiments of the present application, the absorption tower is provided with an air inlet at the bottom and an air outlet at the top, and the lean CO is2A second end of the absorbent line is in communication with the top of the absorber column, the CO-rich stream2The second end of the absorbent pipeline is communicated with the bottom of the absorption tower.
In some embodiments of the present application, the regeneration tower has a gas inlet at the bottom and a gas outlet at the top, and the lean CO is lean2A first end of the absorbent line is in communication with the bottom of the regeneration column, the CO-rich stream2The first end of the absorbent line is in communication with the top of the regeneration column.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: the lean-rich liquid heat exchanger is provided with a first pipeline and a second pipeline which exchange heat with each other, and the first pipeline and the lean CO are arranged2An absorbent conduit in communication with said second conduit and said CO-rich conduit2The absorbent pipelines are communicated.
In some embodiments of the present application, the drive assembly includes a first pump and a second pump, the first pump being mounted at the lean CO2An absorbent pipeline between the lean-rich liquid heat exchanger and the absorption tower, and the second pump is installed in the rich CO2Absorbent pipeline and positioned on the lean-rich liquid heat exchanger and the regeneration towerIn the meantime.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: a first temperature sensor, which is installed on the regeneration tower and is used for detecting a first temperature value T1 of the ship tail gas at an air inlet of the regeneration tower; and the first pump, the second pump and the first temperature sensor are all electrically connected with the controller, and the controller adjusts the rotating speeds of the first pump and the second pump according to the first temperature value T1.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: the second temperature sensor is arranged on the washing impurity removing tower and used for detecting a second temperature value T2 of the ship tail gas at the gas outlet of the washing impurity removing tower; the first flow regulating valve is arranged on the tail gas pipeline; wherein the second temperature sensor and the first flow regulating valve are both electrically connected with the controller, and the controller can adjust the valve port diameter of the first flow regulating valve according to the second temperature value T2.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: further comprising: one end of the water inlet pipe is used for accessing washing water, and the other end of the water inlet pipe is communicated with the spraying device; and the second flow regulating valve is arranged on the water inlet pipe, and is electrically connected with the controller, and the controller can regulate the valve port diameter of the second flow regulating valve according to the second temperature value T2.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: and the pipe section of the tail gas pipeline between the exhaust port of the ship tail gas and the regeneration tower is wrapped by the heat insulation layer.
In some embodiments of the present application, the CO2The absorbent is alkyl alcohol amine.
In some embodiments of the present application, the CO2The absorbent is ethanolamine.
This application is through letting in boats and ships tail gas in the regenerator column, flow into in the absorption tower and the absorption tower CO afterwards2CO in the tail gas of the ship by the reaction of the absorbent2Quilt CO2The absorbent absorbs the CO and flows to the outlet end of the tail gas pipeline from the absorption tower, so that the CO in the ship tail gas discharged by the system is avoided2. In addition, CO is absorbed2CO of2The absorbent then becomes rich in CO2Absorbent, rich in CO2The absorbent is driven by the driving assembly to pass through the rich CO2The absorbent enters the regeneration tower through a pipeline to exchange heat with the ship tail gas, and the heat of the ship tail gas makes the absorbent rich in CO2The temperature of the absorbent is initially increased, thereby reducing the CO-rich2CO in absorbent2Is desorbed with extra energy consumption, has low cost and easy realization, is rich in CO2CO in absorbent2Is desorbed and becomes lean in CO2Absorbent, lean in CO2The absorbent is driven by the driving component to pass through the lean CO2The absorbent pipeline reenters the absorption tower and absorbs CO in the ship tail gas in the absorption tower2Absorption of CO2Is lean in CO2The absorbent becomes rich in CO again2Absorbent, rich in CO2The absorbent is driven by the driving assembly to pass through the rich CO2The absorbent enters a regeneration tower through a pipeline to exchange heat with the ship tail gas, namely CO2The absorbent circulates between the absorption tower and the regeneration tower, and the application makes rich CO by using the heat of the ship tail gas2The temperature of the absorbent is initially increased, thereby reducing the CO-rich2CO in absorbent2Is desorbed with additional required energy consumption.
On the other hand, the application also provides a method for recovering CO by using the waste heat of the ship tail gas2The control method of the system comprises the following steps: controlling the first pump, the second pump and the first temperature sensor to be turned on; acquiring a first temperature value T1; if the first temperature value T1 is greater than a first preset temperature value, controlling the rotating speed of the first pump and the rotating speed of the second pump to increase; if the first temperature value T1 is equal to a first preset temperature value, controllingThe rotating speeds of the first pump and the second pump are kept unchanged; and if the first temperature value T1 is smaller than a first preset temperature value, controlling the rotating speed of the first pump and the rotating speed of the second pump to be reduced.
In some embodiments of the present application, further comprising the steps of: controlling the second temperature sensor to be turned on; acquiring a second temperature value T2; if the second temperature value T2 is greater than a second preset temperature value, controlling the diameter of the valve port of the first flow regulating valve to be reduced; if the second temperature value T2 is equal to the second preset temperature value, controlling the valve port diameter of the first flow regulating valve to be kept unchanged; and if the second temperature value T2 is smaller than the second preset temperature value, controlling the diameter of the valve port of the first flow regulating valve to increase.
In some embodiments of the present application, after the step of obtaining the second temperature value T2, the following steps are further included: if the second temperature value T2 is greater than the second preset temperature value, controlling the diameter of the valve port of the second flow regulating valve to increase; if the second temperature value T2 is equal to the second preset temperature value, controlling the valve port diameter of the second flow regulating valve to be kept unchanged; and if the second temperature value T2 is smaller than the second preset temperature value, controlling the diameter of the valve port of the second flow regulating valve to be reduced.
According to the method and the device, the temperature value of the ship tail gas at the air inlet of the regeneration tower can be clearly known by acquiring the first temperature value T1, so that the ship tail gas can be provided for rich CO2Heat of the absorbent. If the first temperature value T1 is greater than a first preset temperature value, that is, the temperature of the ship tail gas is higher, the ship tail gas can be rich in CO2The absorbent provides more heat, and the rotation speed of the first pump and the second pump is controlled to be increased so as to accelerate CO2The desorption rate of (c). If the first temperature value T1 is equal to the first preset temperature value, it indicates that the rotation speeds of the first pump and the second pump are relatively matched with the current working condition, and the rotation speeds of the first pump and the second pump are kept unchanged. If the first temperature value T1 is less than a first preset temperature value, it indicates that the temperature of the ship tail gas is low, and the ship tail gas is rich in CO2The absorbent provides less heat, and the first stage is controlledThe rotational speed of the pump and the second pump is reduced to reduce the energy consumption consumed by the first pump and the second pump.
Drawings
FIG. 1 shows the recovery of CO by using the waste heat of the ship tail gas2Schematic structural diagram of the system of (1).
The main reference numbers in the drawings accompanying the present specification are as follows:
10-tail gas pipeline; 11-a regeneration column; 12-washing and impurity removing tower; 121-a water inlet pipe; 122-a drain pipe; 13-an absorption column; 20-lean of CO2An absorbent conduit; 21-a first pump; 30-rich in CO2An absorbent conduit; 31-a second pump; 40-lean-rich liquor heat exchanger; 50-CO2A storage tank.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, the application provides a method for recovering CO by using waste heat of ship tail gas2The system comprises: a tail gas pipeline 10 having an inlet end and an outlet end, a regeneration tower 11 and an absorption tower 13 being sequentially arranged between the inlet end and the outlet end, the inlet end being used for communicating with the ship tail gas, and a CO being arranged in the absorption tower 132Absorbent, CO in said marine exhaust gas2Absorbed in the absorption column 13 and discharged from the outlet end; lean in CO2 Absorbent line 20, said CO lean2A first end of an absorbent line 20 is in communication with said regeneration column 11, said lean CO2A second end of the absorbent line 20 is in communication with the absorber 13; rich in CO2 Absorbent line 30, said CO rich2A first end of an absorbent line 30 is in communication with said regeneration column 11, said CO-rich2A second end of the absorbent line 30 is in communication with the absorber 13; a drive assembly disposed at the lean CO2 Absorbent line 20 and/or said CO rich2On the absorbent line 30, is CO2The absorbent provides the driving force for the CO2The absorbent circulates between the absorption tower 13 and the regeneration tower 11.
The application introduces the ship tail gas into the regeneration tower 11, and then flows into the absorption tower 13 and CO in the absorption tower 132CO in the tail gas of the ship by the reaction of the absorbent2Quilt CO2The absorbent absorbs and flows from the absorption tower 13 to the outlet end of the tail gas pipeline 10, and is prevented from being discharged through the systemThe discharged ship tail gas contains CO2. In addition, CO is absorbed2CO of2The absorbent then becomes rich in CO2Absorbent, rich in CO2The absorbent is driven by the driving assembly to pass through the rich CO2The absorbent pipeline 30 enters the regeneration tower 11 to exchange heat with the ship tail gas, and the ship tail gas has a certain temperature when being exhausted, so that the ship tail gas can provide partial heat to enrich CO2The temperature of the absorbent is initially increased, thereby reducing the CO-rich2CO in absorbent2Is desorbed with extra energy consumption, has low cost and easy realization, is rich in CO2CO in absorbent2Is desorbed and becomes lean in CO2Absorbent, lean in CO2The absorbent is driven by the driving component to pass through the lean CO2The absorbent pipeline 20 re-enters the absorption tower 13 and absorbs CO in the ship exhaust gas in the absorption tower 132Absorption of CO2Is lean in CO2The absorbent becomes rich in CO again2Absorbent, rich in CO2The absorbent is driven by the driving assembly to pass through the rich CO2The absorbent pipeline 30 enters the regeneration tower 11 to exchange heat with the ship tail gas, namely CO2The absorbent circulates between the absorption tower 13 and the regeneration tower 11, whereby the present application makes rich of CO by using the heat of the ship's exhaust gas2The temperature of the absorbent is initially increased, thereby reducing the CO-rich2CO in absorbent2Is desorbed with additional required energy consumption.
It should be noted that: the arrows on the exhaust line 10 indicate the direction of the ship exhaust gas flow, and the lean CO is2The arrows on the absorber line 20 indicate that it is CO lean2The direction of flow of the absorbent; the above-mentioned rich CO2The arrows on the absorber line 30 indicate that it is CO-rich2The direction of flow of the absorbent is shown in figure 1.
Based on the embodiment, the method for recovering CO by using the waste heat of the ship tail gas2The system also comprises a reheater, the reheater is communicated with the regeneration tower 11, the reheater is used for generating high-temperature steam and conveying the high-temperature steam into the regeneration tower 11 through a pipeline, and the high-temperature steam is conveyed into the regeneration tower 11 from the bottom in the regeneration tower 11Upward flow to make CO rich2The absorbent exchanges heat with the ship tail gas and the high-temperature steam simultaneously, and finally CO is realized2But the ship tail gas can be enriched in CO2The absorbent provides part of the heat, thereby making the CO rich2CO in absorbent2The consumption of high-temperature steam required by desorption regeneration is reduced, and the energy consumption of a reheater is further reduced. Wherein, for a high-speed machine with high temperature of ship tail gas, the high-temperature steam can be reduced by more than 20 percent.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: and the washing impurity removal tower 12 is arranged on the tail gas pipeline 10 and is positioned between the regeneration tower 11 and the absorption tower 13, a water inlet and a spraying device communicated with the water inlet are arranged on the washing impurity removal tower 12, and the water inlet is used for accessing washing water and is sprayed to the inside of the washing impurity removal tower 12 by the spraying device.
When the ship tail gas enters the inlet end of the tail gas pipeline 10, the tail gas is carbon-containing high-temperature ship tail gas, and is rich in CO in the regeneration tower 112The temperature of the absorbent is initially reduced by heat exchange. Furthermore, the ship tail gas flowing out of the regeneration tower 11 is cooled and purified again in the washing and impurity removing tower 12, so that the ship tail gas is changed into carbon-containing low-temperature ship tail gas, and therefore, on one hand, impurities such as black smoke in the ship tail gas can be removed, and on the other hand, the temperature of the ship tail gas can be reduced to CO2Optimum absorption temperature of absorbent to increase CO2Absorption of CO by absorbent2The efficiency of (c). In addition, due to the fact that the temperature of the ship tail gas is reduced, the heat radiation of the ship can be reduced, the ship is prevented from being monitored by a radar, and the heat stealth function is achieved.
It can be understood that, since the ship runs in the water area, the washing water can be seawater for taking water conveniently, that is, the spraying device is directly connected with the seawater, so that the consumption of domestic water on the ship is avoided.
Furthermore, because of CO2Degradation of the absorbent is difficult to avoid, and therefore it is necessary to supplement CO to the absorption tower 13 in a certain manner2An absorbent.
The control principle can be divided into active control and passive control. So-called active control, i.e. based on predetermined operating conditions and CO2Absorbent consumption rate, timed and quantitative CO replenishment2Absorbent, it is anticipated that if the above-mentioned use of the waste heat of the ship's exhaust gas for recovering CO is provided2When the system operating condition fluctuates greatly, the open-loop active control may be difficult to accurately ensure CO2The concentration of the absorbent is at a set value, and possible errors are gradually accumulated along with the accumulation of time, so that CO is finally caused2The absorption efficiency of (a) is significantly reduced.
Compared with open-loop active control, closed-loop passive control is mainly based on measuring CO2A certain physical property parameter of the absorbent, and mixing with CO2The physical property parameter values of the absorbent with the most appropriate concentration are compared, so that CO can be realized2Closed loop control of sorbent replenishment. According to the difference of the absorbent types, the corresponding physical parameter values comprise resistance (suitable for the non-water absorbent of the ionic liquid phase), pH value (suitable for most organic amine absorbents), viscosity (suitable for the working condition of high concentration of the running amine) and the like. According to CO2By selecting the characteristic of the absorbent and the corresponding value of the parameter of the physical property to be measured, for example, by determining the set concentration as the value of the parameter of the physical property to be measured, the CO can be measured by keeping the concentration constant by feedback control during operation2Precise control of the absorbent.
Based on the above-mentioned embodiment, for the sake of clarity of understanding of CO in the absorption tower 132The volume of the absorbent, and a liquid level sensor arranged in the absorption tower 13 for detecting CO2Level of absorbent when CO2When the liquid level of the absorbent is low, it means that CO should be supplied to the absorption column 132An absorbent.
With reference to fig. 1, a water outlet and an air inlet are arranged at the bottom of the washing and impurity-removing tower 12, the water inlet is communicated with the top of the washing and impurity-removing tower 12, the spraying device is located at the top of the washing and impurity-removing tower 12, an air outlet is also arranged at the top of the washing and impurity-removing tower 12, and the water inlet is arranged above the washing and impurity-removing tower 12, and the water outlet is arranged below the washing and impurity-removing tower 12, so that the washing water in the washing and impurity-removing tower 12 can be collected conveniently. Moreover, the marine tail gas flows upwards from the bottom of the washing impurity removing tower 12, and the washing water is sprayed downwards from the top on the washing impurity removing tower 12, so that the marine tail gas is more fully contacted with the washing water, and the cooling and impurity removing effects of the washing impurity removing tower 12 are better.
It is understood that the drain 122 is connected to the drain of the scrubbing and decontaminating tower 12 to guide the scrubbing water in the scrubbing and decontaminating tower 12 to the outside of the scrubbing and decontaminating tower 12.
In some embodiments of the present application, the absorption tower 13 is provided with an air inlet at the bottom and an air outlet at the top, and the lean CO is lean2A second end of an absorbent line 20 communicates with the top of the absorber 13, the CO-rich2The second end of the absorbent line 30 communicates with the bottom of said absorption column 13, i.e. lean in CO2The absorbent is sprayed downwards from the upper part of the absorption tower 13, the carbon-containing low-temperature ship tail gas treated by the washing impurity removal tower 12 flows upwards from the bottom of the absorption tower 13, and a large amount of CO in the carbon-containing low-temperature ship tail gas flows upwards in the convective mass transfer process2The component is lean in CO2Absorbing by an absorbent to ensure the low CO2Absorption of CO by absorbent2Has better effect, and then removes CO2Is discharged from the exhaust port at the top of the absorption tower 13, while being lean in CO2The absorbent absorbs a large amount of CO2The gas then becomes rich in CO2Absorbent from rich CO2And out the second end of the absorbent line 30.
In some embodiments of the present application, the regeneration tower 11 has an air inlet at the bottom and an air outlet at the top, and the lean CO is lean2A first end of an absorbent line 20 communicates with the bottom of the regeneration column 11, the CO-rich2The first end of the absorbent line 30 communicates with the top of the regeneration column 11, ensuring that the ship's tail gas and CO are rich2The heat exchange effect between the absorbents is good, thereby ensuring the rich CO2Absorbent desorption of CO2The speed of (2).
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: a lean-rich liquid heat exchanger 40, the lean-rich liquid heat exchanger 40 having a mutual heat exchangeA first and a second line for heat exchange, the first line being in communication with the lean CO2An absorbent line 20 in communication with said CO-rich line2Absorbent line 30 is connected and lean in CO2The absorbent absorbs CO in the ship tail gas in the absorption tower 132To become low-temperature CO-rich2Absorbent, rich in CO2The absorbent desorbs CO in the regeneration tower 112To become high-temperature lean CO2Absorbent, thereby high temperature lean CO in lean-rich liquor heat exchanger 402The temperature of the absorbent can be reduced to the optimum temperature for absorbing CO2While low temperature rich in CO2The temperature of the absorbent can be increased initially to reduce the CO-rich2The absorbent has a heat requirement within the regeneration column 11.
Based on the above embodiment, the regeneration tower 11 is further provided with a collection port, and the collection port is communicated with the top of the regeneration tower 11 and is used for collecting CO2CO desorbed by the absorbent2Collecting port and CO2The accumulator tank 50 is connected because of CO2Can be recovered and utilized. For example, CO2Can be used in fire extinguisher, and is provided with CO2Accumulator tank 50 for CO2And (6) carrying out storage.
In addition, CO2The accumulator tank 50 may also be connected to existing gas treatment equipment for the treatment of gaseous CO2Is treated, i.e. gaseous CO is obtained2Change into liquid CO2And is convenient for transportation.
With continued reference to FIG. 1, the drive assembly includes a first pump 21 and a second pump 31, the first pump 21 being mounted to the lean CO2An absorbent pipeline 20 is arranged between the lean rich liquid heat exchanger 40 and the absorption tower 13, and the second pump 31 is arranged on the rich CO2An absorbent line 30 is provided between the lean-rich heat exchanger 40 and the regeneration tower 11, whereby the lean CO can be obtained by adjusting the rotation speed of the first pump 212CO lean in the absorbent line 202The flow rate of the absorbent is adjusted and the rotational speed of the second pump 31 is adjusted to enable the enrichment of CO2CO enrichment in the absorbent line 302The flow of the absorbent is regulated.
In the first of this applicationIn some embodiments, the recycling of CO by using the waste heat of the ship exhaust gas2The system of (1) further comprising: a first temperature sensor, installed on the regeneration tower 11, for detecting a first temperature value T1 of the marine exhaust gas at an air inlet of the regeneration tower 11; the first pump 21, the second pump 31 and the first temperature sensor are all electrically connected with the controller, and the controller adjusts the rotating speeds of the first pump 21 and the second pump 31 according to the first temperature value T1, so that the rotating speeds of the first pump 21 and the second pump 31 are more matched with the current working condition of the system, and CO is ensured2The absorbent has better heat exchange efficiency with the ship tail gas, thereby ensuring CO2Desorption rate of the absorbent.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: the second temperature sensor is arranged on the washing and impurity removing tower 12 and is used for detecting a second temperature value T2 of the marine tail gas at the air outlet of the washing and impurity removing tower 12; the first flow regulating valve is arranged on the tail gas pipeline 10; the second temperature sensor and the first flow regulating valve are both electrically connected with the controller, the controller can regulate the diameter of the valve port of the first flow regulating valve according to the second temperature value T2, and the high temperature of the marine tail gas at the air outlet of the scrubbing and impurity removing tower 12 indicates that the marine tail gas and CO are high2The heat exchange efficiency between the absorbents is low, and CO entering the regeneration tower 112The temperature of the absorbent is relatively high, and the diameter of the valve port controlling the first flow regulating valve is reduced due to the same flow of CO2The absorbent needs to desorb CO2The required amount of heat is not changed, and thus the temperature of the ship exhaust gas at the gas outlet of the scrubbing and impurity-removing tower 12 can be lowered by reducing the flow rate of the ship exhaust gas.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: one end of the water inlet pipe 121 is used for receiving washing water, and the other end of the water inlet pipe 121 is communicated with the spraying device; a second flow rate adjusting valve provided on the water inlet pipe 121, wherein,the second flow regulating valve is electrically connected with the controller, and the controller can regulate the diameter of a valve port of the second flow regulating valve according to the second temperature value T2, so that the temperature of the ship tail gas discharged from the gas outlet of the washing impurity removing tower 12 is regulated, and the ship tail gas is ensured to be closer to CO2The proper absorption temperature of the absorbent ensures the CO in the ship tail gas entering the absorption tower 132Can be coated with CO2The absorbent absorbs efficiently.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The system of (1) further comprising: the heat preservation layer wraps the pipe section between the exhaust port of the ship tail gas and the regeneration tower 11, so that the heat loss of the ship tail gas in the flowing process to the regeneration tower 11 is avoided, and the phenomenon that the ship tail gas is rich in CO due to the fact that the heat loss occurs is avoided2The desorption rate of the absorbent decreases.
Based on the above example, the CO2The absorbent is alcohol amine. The alcohol amine includes alkyl alcohol amine and alkylene alcohol amine, and the alkyl alcohol amine includes primary amine (represented by ethanolamine MEA), secondary amine (represented by DEA), and tertiary amine (represented by MDEA).
On the other hand, the application also provides a method for recovering CO by using the waste heat of the ship tail gas2The control method of the system comprises the following steps: controlling the first pump, the second pump and the first temperature sensor to be turned on; acquiring a first temperature value T1; if the first temperature value T1 is greater than a first preset temperature value, controlling the rotating speed of the first pump and the rotating speed of the second pump to increase; if the first temperature value T1 is equal to a first preset temperature value, controlling the rotating speeds of the first pump and the second pump to be kept unchanged; and if the first temperature value T1 is smaller than a first preset temperature value, controlling the rotating speed of the first pump and the rotating speed of the second pump to be reduced.
According to the method and the device, the temperature value of the ship tail gas at the air inlet of the regeneration tower can be clearly known by acquiring the first temperature value T1, so that the ship tail gas can be provided for rich CO2Heat of the absorbent. If the first temperature value T1 is greater than a first preset temperature value, the temperature value is indicative of the ship tail gasThe temperature is high, and the tail gas of the ship can be rich in CO2The absorbent provides more heat, and the rotation speed of the first pump and the second pump is controlled to be increased so as to accelerate CO2The desorption rate of (c). If the first temperature value T1 is equal to the first preset temperature value, it indicates that the rotation speeds of the first pump and the second pump are relatively matched with the current working condition, and the rotation speeds of the first pump and the second pump are kept unchanged. If the first temperature value T1 is less than a first preset temperature value, it indicates that the temperature of the ship tail gas is low, and the ship tail gas is rich in CO2The absorbent provides less heat, and the rotating speed of the first pump and the second pump is controlled to be reduced so as to reduce the energy consumption consumed by the first pump and the second pump.
It can be understood that the start and stop of the first pump, the second pump and the first temperature sensor are all controlled by a controller, the controller further comprises a storage module and a calculation module, wherein the first preset temperature is stored in the storage module in advance, and the comparison between the first temperature value T1 and the first preset temperature value is carried out by the calculation module for comparison and judgment.
In addition, the first preset temperature may be CO2Suitable desorption temperature of the absorbent. Due to different CO2The suitable desorption temperature of the absorbent varies, whereby the skilled person can vary the CO according to the type2The absorbent is set to a different first preset temperature value.
In some embodiments of the present application, the above-mentioned recycling of CO by using waste heat of ship exhaust gas2The control method of a system of (1) further comprises the steps of: controlling the second temperature sensor to be turned on; acquiring a second temperature value T2; if the second temperature value T2 is greater than a second preset temperature value, controlling the diameter of the valve port of the first flow regulating valve to be reduced; if the second temperature value T2 is equal to the second preset temperature value, controlling the valve port diameter of the first flow regulating valve to be kept unchanged; and if the second temperature value T2 is smaller than the second preset temperature value, controlling the diameter of the valve port of the first flow regulating valve to increase.
If the second temperature value T2 is greater than the second preset temperature value, it indicates that the effect of cooling the ship tail gas by the washing and impurity removing tower is poor, and the temperature of the ship tail gas is high, and at this time, the diameter of the valve port of the first flow regulating valve is controlled to be reduced, so as to reduce the flow of the ship tail gas, and reduce the temperature of the ship tail gas so as to approach the second preset temperature. And if the second temperature value T2 is equal to a second preset temperature value, controlling the diameter of the valve port of the first flow regulating valve to be kept unchanged. If the second temperature value T2 is less than the second preset temperature value, which indicates that the washing and impurity removing tower has a good cooling effect on the ship tail gas and the temperature of the ship tail gas is low, the diameter of the valve port of the first flow regulating valve is controlled to increase so as to increase the flow of the ship tail gas and increase the temperature of the ship tail gas to approach the second preset temperature.
The opening and closing of the second temperature sensor is controlled by the controller, the second preset temperature is stored in the storage module in advance, and the comparison between the second temperature value T2 and the second preset temperature value is carried out by the calculation module for comparison and judgment.
In addition, the second preset temperature may be CO2The optimum absorption temperature of the absorbent. Due to different CO2The optimum absorption temperature of the absorbent varies, whereby the skilled person can vary the CO2The absorbent is set to a second, different preset temperature value.
In some embodiments of the present application, after the step of obtaining the second temperature value T2, the following steps are further included: if the second temperature value T2 is greater than the second preset temperature value, controlling the diameter of the valve port of the second flow regulating valve to increase; if the second temperature value T2 is equal to the second preset temperature value, controlling the valve port diameter of the second flow regulating valve to be kept unchanged; and if the second temperature value T2 is smaller than the second preset temperature value, controlling the diameter of the valve port of the second flow regulating valve to be reduced.
If the second temperature value T2 is greater than the second preset temperature value, it indicates that the effect of cooling the ship tail gas by the washing and impurity removing tower is poor, and the temperature of the ship tail gas is high, at this time, the diameter of the valve port of the second flow regulating valve is controlled to be increased, so as to increase the water spraying amount of the spraying device, and reduce the temperature of the ship tail gas so as to approach the second preset temperature. And if the second temperature value T2 is equal to a second preset temperature value, controlling the diameter of the valve port of the second flow regulating valve to be kept unchanged. If the second temperature value T2 is less than the second preset temperature value, it indicates that the washing and impurity removing tower has a good cooling effect on the ship tail gas and the temperature of the ship tail gas is low, and at this time, the diameter of the valve port of the second flow regulating valve is controlled to be reduced to reduce the water spraying amount of the spraying device, so that the temperature of the ship tail gas is increased to approach the second preset temperature.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. CO recovery by using ship tail gas waste heat2The system of (a), comprising:
the tail gas pipeline is provided with an inlet end and an outlet end, a regeneration tower and an absorption tower are sequentially arranged between the inlet end and the outlet end, the inlet end is used for being communicated with ship tail gas, and CO is arranged in the absorption tower2Absorbent, CO in said marine exhaust gas2Absorbed in the absorption tower and discharged from the outlet end;
lean in CO2An absorbent line, the CO lean2A first end of an absorbent line is in communication with the regeneration tower, the lean CO2The second end of the absorbent pipeline is communicated with the absorption tower;
rich in CO2An absorbent line, said CO-rich2A first end of the absorbent line is in communication with the regeneration column, the CO-rich stream2The second end of the absorbent pipeline is communicated with the absorption tower;
a drive assembly disposed at the lean CO2Absorbent line and/or said CO rich2On the absorbent line, is CO2The absorbent provides the driving force for the CO2The absorbent circulates between the absorption tower and the regeneration tower.
2. The method for recovering CO by using the waste heat of the ship tail gas according to claim 12The system of (a), further comprising:
and the washing impurity removal tower is arranged on the tail gas pipeline and is positioned between the regeneration tower and the absorption tower, a water inlet and a spraying device communicated with the water inlet are arranged on the washing impurity removal tower, and the water inlet is used for accessing washing water and is sprayed to the inside of the washing impurity removal tower by the spraying device.
3. The method for recovering CO by using the waste heat of the ship tail gas according to claim 22The system is characterized in that a water outlet and an air inlet are arranged at the bottom of the washing and impurity removing tower, the water inlet is communicated with the top of the washing and impurity removing tower, the spraying device is positioned at the top of the washing and impurity removing tower, and an air outlet is also arranged at the top of the washing and impurity removing tower.
4. The method for recovering CO by using the waste heat of the ship tail gas according to claim 22The system is characterized in that the bottom of the absorption tower is provided with an air inlet, the top of the absorption tower is provided with an air outlet, and the lean CO is2A second end of the absorbent line is in communication with the top of the absorber column, the CO-rich stream2The second end of the absorbent pipeline is communicated with the bottom of the absorption tower.
5. The method for recovering CO by using the waste heat of the ship tail gas according to claim 42The system is characterized in that the bottom of the regeneration tower is provided with an air inlet, the top of the regeneration tower is provided with an air outlet, and the lean CO is generated2A first end of the absorbent line is in communication with the bottom of the regeneration column, the CO-rich stream2The first end of the absorbent line is in communication with the top of the regeneration column.
6. Root of herbaceous plantThe method for recovering CO by using the waste heat of the ship tail gas according to any one of claims 3-52The system of (a), further comprising:
the lean-rich liquid heat exchanger is provided with a first pipeline and a second pipeline which exchange heat with each other, and the first pipeline and the lean CO are arranged2An absorbent conduit in communication with said second conduit and said CO-rich conduit2The absorbent pipelines are communicated.
7. The method for recovering CO by using the waste heat of the ship tail gas according to claim 62Wherein the drive assembly comprises a first pump and a second pump, the first pump being mounted to the lean CO2An absorbent pipeline between the lean-rich liquid heat exchanger and the absorption tower, and the second pump is installed in the rich CO2And the absorbent pipeline is positioned between the lean-rich liquid heat exchanger and the regeneration tower.
8. The method for recovering CO by using the waste heat of the ship tail gas according to claim 72The system of (a), further comprising:
the first temperature sensor is arranged on the regeneration tower and used for detecting a first temperature value of the ship tail gas at an air inlet of the regeneration tower;
the first pump, the second pump and the first temperature sensor are all electrically connected with the controller, and the controller adjusts the rotating speed of the first pump and the rotating speed of the second pump according to the first temperature value.
9. The method for recovering CO by using the waste heat of the ship tail gas according to claim 82The system of (a), further comprising:
the second temperature sensor is arranged on the washing impurity removing tower and used for detecting a second temperature value of the ship tail gas at the gas outlet of the washing impurity removing tower;
the first flow regulating valve is arranged on the tail gas pipeline;
the second temperature sensor and the first flow regulating valve are both electrically connected with the controller, and the controller can regulate the valve port diameter of the first flow regulating valve according to the second temperature value.
10. The method for recovering CO by using the waste heat of the ship tail gas according to claim 92The system of (a), further comprising:
one end of the water inlet pipe is used for accessing washing water, and the other end of the water inlet pipe is communicated with the spraying device;
the second flow regulating valve is arranged on the water inlet pipe;
wherein the second flow regulating valve is electrically connected with the controller, and the controller can regulate the valve port diameter of the second flow regulating valve according to the second temperature value.
11. The method for recovering CO by using the waste heat of the ship tail gas according to claim 12The system of (a), further comprising:
and the pipe section of the tail gas pipeline between the exhaust port of the ship tail gas and the regeneration tower is wrapped by the heat insulation layer.
12. The method for recovering CO by using the waste heat of the ship tail gas according to claim 12The system of (A), wherein the CO is2The absorbent is alkyl alcohol amine.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113731147A (en) * | 2021-08-20 | 2021-12-03 | 中国船舶重工集团公司第七一一研究所 | CO recovery by using ship tail gas waste heat2System and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113731147A (en) * | 2021-08-20 | 2021-12-03 | 中国船舶重工集团公司第七一一研究所 | CO recovery by using ship tail gas waste heat2System and control method |
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Address after: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee after: The 711 Research Institute of China Shipbuilding Corp. Address before: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee before: Shanghai Marine Diesel Engine Research Institute |