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CN116379708A - A heat exchange medium circulation device and process for medium-pressure compression liquefaction of carbon dioxide - Google Patents

A heat exchange medium circulation device and process for medium-pressure compression liquefaction of carbon dioxide Download PDF

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CN116379708A
CN116379708A CN202310357469.XA CN202310357469A CN116379708A CN 116379708 A CN116379708 A CN 116379708A CN 202310357469 A CN202310357469 A CN 202310357469A CN 116379708 A CN116379708 A CN 116379708A
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heat exchanger
carbon dioxide
exchange medium
heat exchange
heat
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杨林军
汪静
张习文
吕超
金理健
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Southeast University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0266—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
    • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
    • F25J3/067—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/02—Compressor intake arrangement, e.g. filtering or cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/32—Compression of the product stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop

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  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

本发明公开了一种用于二氧化碳中压压缩液化的换热介质循环装置及工艺，涉及二氧化碳压缩液化技术领域，解决了二氧化碳压缩液化工艺能耗较高、换热介质消耗较大的技术问题，其技术方案要点是，利用液化天然气冷能液化二次压缩后的气态二氧化碳，使其达到泵送要求，再采用泵增压至液化压力；第一换热器的换热介质通入第四换热器，对泵送增压后的二氧化碳进行换热，使其达到液化所需温度，第四换热器出口的换热介质通入第二换热器，将第一换热器、第四换热器和第二换热器通过第五换热器和第二泵构成换热介质的循环装置，具有能耗低的特点，实现了换热介质零消耗。

Figure 202310357469

The invention discloses a heat exchange medium circulation device and process for medium-pressure compression liquefaction of carbon dioxide, relates to the technical field of carbon dioxide compression liquefaction, and solves the technical problems of high energy consumption and large consumption of heat exchange medium in the carbon dioxide compression liquefaction process. The main point of the technical scheme is to use the cold energy of liquefied natural gas to liquefy the gaseous carbon dioxide after the secondary compression to meet the pumping requirements, and then use the pump to pressurize to the liquefaction pressure; the heat exchange medium of the first heat exchanger is passed into the fourth heat exchanger. The heat exchanger is used to exchange heat for the pumped pressurized carbon dioxide to make it reach the temperature required for liquefaction, and the heat exchange medium at the outlet of the fourth heat exchanger is passed into the second heat exchanger, and the first heat exchanger, the fourth heat exchanger The heat exchanger and the second heat exchanger form a heat exchange medium circulation device through the fifth heat exchanger and the second pump, which has the characteristics of low energy consumption and realizes zero consumption of heat exchange medium.

Figure 202310357469

Description

一种用于二氧化碳中压压缩液化的换热介质循环装置及工艺A heat exchange medium circulation device and process for medium-pressure compression liquefaction of carbon dioxide

技术领域technical field

本发明涉及二氧化碳压缩液化技术领域，尤其涉及一种用于二氧化碳中压压缩液化的换热介质循环装置及工艺。The invention relates to the technical field of carbon dioxide compression liquefaction, in particular to a heat exchange medium circulation device and process for medium-pressure compression liquefaction of carbon dioxide.

背景技术Background technique

二氧化碳排放是导致全球变暖的最重要因素，如何捕集和利用二氧化碳成为各国研究的热点。CCUS(碳捕获、利用与封存)技术是大规模碳减排的有效方法之一，对解决全球气候变化问题意义重大。作为CCUS一环，二氧化碳压缩液化极为重要。Carbon dioxide emission is the most important factor leading to global warming, how to capture and utilize carbon dioxide has become a research hotspot in various countries. CCUS (Carbon Capture, Utilization and Storage) technology is one of the effective methods for large-scale carbon emission reduction, and it is of great significance to solve the problem of global climate change. As a part of CCUS, carbon dioxide compression liquefaction is extremely important.

根据液化压力的不同，二氧化碳压缩液化可以分为高压法、中压法和低压法。低压压缩所需要的温度较低，常规的制冷器无法满足，需要专门的制冷系统，且流程中需要的装置复杂，导致造价较高、能耗较大。高压压缩后的二氧化碳处于高压状态，后续存在储存和输送问题。中压压缩所需温度高于低压法，且液化压力低于高压法，可以有效避免高压法和低压法过程中存在的部分问题。但无论哪种压缩方式，都存在能耗较大的问题。According to the different liquefaction pressure, carbon dioxide compression liquefaction can be divided into high pressure method, medium pressure method and low pressure method. The temperature required for low-pressure compression is low, which cannot be met by conventional refrigerators, and requires a special refrigeration system, and the devices required in the process are complex, resulting in high cost and high energy consumption. Carbon dioxide compressed under high pressure is in a high-pressure state, and there are subsequent storage and transportation problems. The temperature required for medium-pressure compression is higher than that of low-pressure method, and the liquefaction pressure is lower than that of high-pressure method, which can effectively avoid some problems in the process of high-pressure method and low-pressure method. But no matter what kind of compression method, there is a problem of large energy consumption.

二氧化碳压缩液化工艺目前的主要问题是能耗较高且换热介质消耗较大等问题。这主要是因为每级压缩机压缩完后，二氧化碳的温度处于较高的水平，在进入下第一压缩前需要冷却至较低温度，一般采用水作为换热介质，但是这部分换热介质完成换热后在该工艺中就失去了作用，且需要源源不断输入换热介质。因此，如何降低二氧化碳压缩液化过程的能耗和换热介质的消耗，从而开发一种能耗较低、换热介质消耗较小的二氧化碳压缩液化工艺具有重要意义。The current main problems of the carbon dioxide compression liquefaction process are high energy consumption and large consumption of heat exchange medium. This is mainly because the temperature of carbon dioxide is at a relatively high level after each stage of compressor is compressed, and it needs to be cooled to a lower temperature before entering the next compression. Generally, water is used as the heat exchange medium, but this part of the heat exchange medium is completed After heat exchange, it loses its function in the process, and needs to continuously input heat exchange medium. Therefore, how to reduce the energy consumption and heat exchange medium consumption of the carbon dioxide compression liquefaction process is of great significance to develop a carbon dioxide compression liquefaction process with low energy consumption and heat exchange medium consumption.

发明内容Contents of the invention

本发明目的在于针对现有技术的缺陷，提供一种用于二氧化碳中压压缩液化的换热介质循环装置及工艺，以降低二氧化碳压缩过程的能耗以及换热介质的消耗。The object of the present invention is to address the defects of the prior art, and provide a heat exchange medium circulation device and process for medium-pressure compression and liquefaction of carbon dioxide, so as to reduce energy consumption and heat exchange medium consumption in the carbon dioxide compression process.

为解决上述技术问题，本发明提供技术方案如下：In order to solve the problems of the technologies described above, the present invention provides technical solutions as follows:

一种用于二氧化碳中压压缩液化的换热介质循环装置，其特征在于：包括包括气态二氧化碳输送管道、第一换热器、第一压缩机、第二换热器、第二压缩机、第三换热器、第一泵、第四换热器、第二泵及液态二氧化碳输送管道；A heat exchange medium circulation device for medium-pressure compression liquefaction of carbon dioxide, characterized in that it includes a gaseous carbon dioxide delivery pipeline, a first heat exchanger, a first compressor, a second heat exchanger, a second compressor, a second Three heat exchangers, the first pump, the fourth heat exchanger, the second pump and the liquid carbon dioxide delivery pipeline;

其中，气态二氧化碳输送管道与第一换热器热流股入口连通，第一换热器热流股出口经过第一压缩机后与所述第二换热器的热流股入口连通，第二换热器的热流股出口经过第二压缩机后与第三换热器热流股入口连通，第三换热器热流股出口经过第一泵后与第四换热器冷流体入口连通，第四换热器冷流体出口与液态二氧化碳输送管道连通；Wherein, the gaseous carbon dioxide delivery pipeline communicates with the hot stream inlet of the first heat exchanger, the hot stream outlet of the first heat exchanger passes through the first compressor and communicates with the hot stream inlet of the second heat exchanger, and the second heat exchanger After passing through the second compressor, the hot stream outlet of the third heat exchanger is connected with the hot stream inlet of the third heat exchanger, and the hot stream outlet of the third heat exchanger is connected with the cold fluid inlet of the fourth heat exchanger after passing through the first pump, and the fourth heat exchanger The cold fluid outlet communicates with the liquid carbon dioxide delivery pipeline;

第一换热器的冷流股出口与第四换热器的热流体入口连通，第四换热器的热流体出口与第二换热器的冷流股入口连通，第二换热器的冷流股出口经过第二泵后与第一换热器的冷流股入口连通，构成换热介质循环回路。The cold stream outlet of the first heat exchanger communicates with the hot fluid inlet of the fourth heat exchanger, the hot fluid outlet of the fourth heat exchanger communicates with the cold stream inlet of the second heat exchanger, and the The cold stream outlet is communicated with the cold stream inlet of the first heat exchanger after passing through the second pump, forming a heat exchange medium circulation loop.

进一步的，还包括设置在所述第二换热器和第二泵之间的第五换热器，第二换热器冷流股出口连接第五换热器热流体入口，第五换热器热流体出口连接第二泵，第三换热器冷流股出口连接第五换热器冷流股入口。Further, it also includes a fifth heat exchanger arranged between the second heat exchanger and the second pump, the cold stream outlet of the second heat exchanger is connected to the hot fluid inlet of the fifth heat exchanger, and the fifth heat exchanger The hot fluid outlet of the heat exchanger is connected to the second pump, and the cold stream outlet of the third heat exchanger is connected to the cold stream inlet of the fifth heat exchanger.

进一步的，还包括第一分离塔，所述第一分离塔设置在所述第一换热器热流股出口和第一压缩机入口之间。Further, a first separation tower is also included, and the first separation tower is arranged between the hot stream outlet of the first heat exchanger and the inlet of the first compressor.

进一步的，还包括第二分离塔，所述第二分离塔设置在所述第二换热器热流股出口和第二压缩机入口之间。Further, a second separation tower is also included, and the second separation tower is arranged between the hot stream outlet of the second heat exchanger and the inlet of the second compressor.

进一步的，所述第三换热器中的换热介质为液态天然气。Further, the heat exchange medium in the third heat exchanger is liquid natural gas.

进一步的，所述第一换热器、第二换热器、第四换热器中的换热介质均为水。Further, the heat exchange media in the first heat exchanger, the second heat exchanger and the fourth heat exchanger are all water.

一种用于二氧化碳中压压缩液化的换热介质循环工艺，其特征在于：待压缩的二氧化碳气体自气态二氧化碳输送管道进入第一换热器与换热介质水换热后，依次通过第一分离塔、第一压缩机后在第二换热器与换热介质水换热，再依次通过第二分离塔、第二压缩机后在第三换热器与换热介质天然气换热，最后通过第一泵后在第四换热器与换热介质水换热，最后从液态二氧化碳输送管道输出液态二氧化碳；A heat exchange medium circulation process for medium-pressure compression liquefaction of carbon dioxide, characterized in that: the carbon dioxide gas to be compressed enters the first heat exchanger from the gaseous carbon dioxide delivery pipeline and exchanges heat with the heat exchange medium water, and then passes through the first separation After the tower and the first compressor, the second heat exchanger exchanges heat with the heat exchange medium water, and then passes through the second separation tower, the second compressor, and the third heat exchanger exchanges heat with the heat exchange medium natural gas, and finally passes through the After the first pump, exchange heat with the heat exchange medium water in the fourth heat exchanger, and finally output liquid carbon dioxide from the liquid carbon dioxide delivery pipeline;

其中，换热介质水依次经过第一换热器、第四换热器、第二换热器、第五换热器后，经第二泵回到第一换热器形成换热介质水的循环；Wherein, after the heat exchange medium water passes through the first heat exchanger, the fourth heat exchanger, the second heat exchanger, and the fifth heat exchanger in sequence, it returns to the first heat exchanger through the second pump to form the heat exchange medium water. cycle;

换热介质液态天然气进入依次经过第三换热器和第五换热器换热，通过调节第五换热器冷流股出口换热介质天然气的温度从而调节第二泵出口换热介质水的温度。The heat exchange medium liquefied natural gas enters and passes through the third heat exchanger and the fifth heat exchanger in turn for heat exchange. By adjusting the temperature of the heat exchange medium natural gas at the outlet of the cold stream of the fifth heat exchanger, the temperature of the heat exchange medium water at the outlet of the second pump is adjusted. temperature.

进一步的，气态二氧化碳经第一压缩机、第二压缩机压缩后，采用第一泵增压至液化所需压力。Further, after the gaseous carbon dioxide is compressed by the first compressor and the second compressor, the first pump is used to pressurize it to the pressure required for liquefaction.

进一步的，所述液态二氧化碳输送管道中液态二氧化碳温度为-20℃、压力为2MPa。Further, the temperature of the liquid carbon dioxide in the liquid carbon dioxide delivery pipeline is -20°C and the pressure is 2MPa.

进一步的，气态二氧化碳经第一换热器和第二换热器的换热后的温度均为40℃。Further, the temperature of the gaseous carbon dioxide after heat exchange in the first heat exchanger and the second heat exchanger is both 40°C.

与现有技术相比，本发明的有益效果是：本申请所述的用于二氧化碳中压压缩液化的换热介质循环装置与工艺，将第二压缩后的二氧化碳利用泵加压至液化所需压力，显著降低能耗；因第一换热器、第二换热器和第四换热器分别对二氧化碳气流进行降温、降温、升温的处理，故依次将第一换热器、第四换热器、第二换热器进行串联，从而将换热介质多次利用，减少换热介质的消耗；同时，液化天然气经第三换热器对二氧化碳进行降温处理后仍然具有可利用冷能，故通过第五换热器利用液化天然气剩余冷能对第二换热器出口的换热介质进行升温处理，再经泵加压后使得换热介质构成循环换热作用。Compared with the prior art, the beneficial effect of the present invention is: the heat exchange medium circulation device and process for medium-pressure compression and liquefaction of carbon dioxide described in this application can pressurize the second compressed carbon dioxide to the required level for liquefaction by using a pump. pressure, significantly reducing energy consumption; because the first heat exchanger, the second heat exchanger, and the fourth heat exchanger respectively cool down, cool down, and heat up the carbon dioxide gas flow, so the first heat exchanger, the fourth heat exchanger, and the The heat exchanger and the second heat exchanger are connected in series, so that the heat exchange medium can be used multiple times to reduce the consumption of the heat exchange medium; at the same time, the liquefied natural gas still has usable cold energy after cooling the carbon dioxide through the third heat exchanger. Therefore, through the fifth heat exchanger, the remaining cold energy of the liquefied natural gas is used to raise the temperature of the heat exchange medium at the outlet of the second heat exchanger, and then pressurized by the pump to make the heat exchange medium form a circular heat exchange effect.

本申请实现了二氧化碳压缩液化工艺中换热介质的循环作用，使得二氧化碳压缩液化工艺的能耗大幅降低，换热介质消耗降低，提高了能量利用率。The application realizes the circulation of the heat exchange medium in the carbon dioxide compression liquefaction process, so that the energy consumption of the carbon dioxide compression liquefaction process is greatly reduced, the heat exchange medium consumption is reduced, and the energy utilization rate is improved.

附图说明Description of drawings

图1为本发明实施例装置结构示意图；Fig. 1 is the schematic diagram of the device structure of the embodiment of the present invention;

其中：1-第一换热器；2-第一分离塔；3-第一压缩机；4-第二换热器；5-第二分离塔；6-第二压缩机；7-第三换热器；8-第一泵；9-第四换热器；10-第五换热器；11-第二泵；12-气态二氧化碳输送管道；13-液态二氧化碳输送管道。Among them: 1-the first heat exchanger; 2-the first separation tower; 3-the first compressor; 4-the second heat exchanger; 5-the second separation tower; 6-the second compressor; 7-the third 8-first pump; 9-fourth heat exchanger; 10-fifth heat exchanger; 11-second pump; 12-gas carbon dioxide delivery pipeline; 13-liquid carbon dioxide delivery pipeline.

具体实施方式Detailed ways

为了加深本发明的理解，下面我们将结合附图对本发明作进一步详述，该实施例仅用于解释本发明，并不构成对本发明保护范围的限定。In order to deepen the understanding of the present invention, we will further describe the present invention in conjunction with the accompanying drawings below. This embodiment is only used to explain the present invention and does not constitute a limitation to the protection scope of the present invention.

图1示出了一种用于二氧化碳中压压缩液化的换热介质循环装置，包括气态二氧化碳输送管道12、第一换热器1、第一分离塔2、第一压缩机3、第二换热器4、第二分离塔5、第二压缩机6、第三换热器7、第一泵8、第四换热器9、第五换热器10、第二泵11及液态二氧化碳输送管道13；Figure 1 shows a heat exchange medium circulation device for medium-pressure compression liquefaction of carbon dioxide, including a gaseous carbon dioxide delivery pipeline 12, a first heat exchanger 1, a first separation tower 2, a first compressor 3, a second exchanger Heater 4, second separation tower 5, second compressor 6, third heat exchanger 7, first pump 8, fourth heat exchanger 9, fifth heat exchanger 10, second pump 11 and liquid carbon dioxide transport pipe 13;

其中，气态二氧化碳输送管道12与第一换热器1热流股入口连通，第一换热器1热流股出口经过第一分离塔2、第一压缩机3后与第二换热器4的热流股入口连通，第二换热器4的热流股出口经过第二分离塔5、第二压缩机6后与第三换热器7热流股入口连通，第三换热器7热流股出口经过第一泵8后与第四换热器9冷流体入口连通，第四换热器9冷流体出口与液态二氧化碳输送管道13连通；Wherein, the gaseous carbon dioxide delivery pipeline 12 communicates with the hot stream inlet of the first heat exchanger 1, and the hot stream outlet of the first heat exchanger 1 passes through the first separation tower 2, the first compressor 3 and the heat flow of the second heat exchanger 4. The hot stream inlet of the second heat exchanger 4 is communicated with the hot stream inlet of the third heat exchanger 7 after passing through the second separation tower 5 and the second compressor 6, and the hot stream outlet of the third heat exchanger 7 passes through the first The first pump 8 communicates with the cold fluid inlet of the fourth heat exchanger 9, and the cold fluid outlet of the fourth heat exchanger 9 communicates with the liquid carbon dioxide delivery pipeline 13;

第一换热器1的冷流股出口与第四换热器9的热流体入口连通，第四换热器9的热流体出口与第二换热器4的冷流股入口连通，第二换热器4的冷流股出口连接第五换热器10热流体入口，第五换热器10热流体出口经过第二泵11后与第一换热器1的冷流股入口连通，构成换热介质水的循环回路。The cold stream outlet of the first heat exchanger 1 communicates with the hot fluid inlet of the fourth heat exchanger 9, the hot fluid outlet of the fourth heat exchanger 9 communicates with the cold stream inlet of the second heat exchanger 4, and the second heat exchanger 4 communicates with the cold stream inlet. The cold stream outlet of the heat exchanger 4 is connected to the hot fluid inlet of the fifth heat exchanger 10, and the hot fluid outlet of the fifth heat exchanger 10 passes through the second pump 11 and communicates with the cold stream inlet of the first heat exchanger 1, forming Circulation circuit of heat exchange medium water.

优选的，第三换热器7中的换热介质为液态天然气，第一换热器1、第二换热器4、第四换热器9中的换热介质均为水，天然气和水在第五换热器10中换热。Preferably, the heat exchange medium in the third heat exchanger 7 is liquefied natural gas, the heat exchange medium in the first heat exchanger 1, the second heat exchanger 4, and the fourth heat exchanger 9 are all water, natural gas and water Heat is exchanged in the fifth heat exchanger 10 .

利用上述实施例的用于二氧化碳中压压缩液化的换热介质循环工艺，其实施步骤包括：首先待压缩的二氧化碳气体自气态二氧化碳输送管道12进入第一换热器1与换热介质水换热降温后，依次通过第一分离塔2除去水分以及第一压缩机3增压；然后在第二换热器4与换热介质水换热降温后，依次通过第二分离塔5进一步除去水分以及第二压缩机6后增压；接着在第三换热器7与换热介质天然气换热降温，利用液态天然气冷能实现泵送的液态条件；最后通过第一泵8增压至液化所需压力后在第四换热器9与换热介质水换热升温，最后从液态二氧化碳输送管道13输出液态二氧化碳；Utilizing the heat exchange medium circulation process for medium-pressure compression liquefaction of carbon dioxide in the above embodiment, the implementation steps include: first, the carbon dioxide gas to be compressed enters the first heat exchanger 1 from the gaseous carbon dioxide delivery pipeline 12 to exchange heat with the heat exchange medium water After cooling down, remove the moisture and pressurize the first compressor 3 successively through the first separation tower 2; then after the second heat exchanger 4 exchanges heat with the heat exchange medium water to cool down, further remove the moisture and After the second compressor 6 is pressurized; then the third heat exchanger 7 exchanges heat with the heat exchange medium natural gas to cool down, and utilizes the cold energy of the liquefied natural gas to realize the liquid state of pumping; finally, the first pump 8 is pressurized to the required level for liquefaction. After the pressure, the fourth heat exchanger 9 exchanges heat with the heat exchange medium water to raise the temperature, and finally outputs the liquid carbon dioxide from the liquid carbon dioxide delivery pipeline 13;

其中，换热介质水依次经过第一换热器1、第四换热器9、第二换热器4、第五换热器10后，经第二泵11回到第一换热器1形成换热介质水的循环；Among them, the heat exchange medium water passes through the first heat exchanger 1, the fourth heat exchanger 9, the second heat exchanger 4, and the fifth heat exchanger 10 in sequence, and returns to the first heat exchanger 1 through the second pump 11. Form the circulation of heat exchange medium water;

换热介质液态天然气进入依次经过第三换热器7和第五换热器10换热，通过调节第五换热器10冷流股出口换热介质天然气的温度从而调节第二泵11出口换热介质水的温度。The heat exchange medium liquefied natural gas enters and passes through the third heat exchanger 7 and the fifth heat exchanger 10 for heat exchange in sequence. By adjusting the temperature of the heat exchange medium natural gas at the outlet of the cold stream of the fifth heat exchanger 10, the outlet exchange rate of the second pump 11 is adjusted. The temperature of the heat medium water.

待压缩气态二氧化碳经第一压缩机3、第二压缩机6压缩后，采用第一泵8增压至液化所需压力，再经第四换热器9换热至液化温度。After the gaseous carbon dioxide to be compressed is compressed by the first compressor 3 and the second compressor 6, the first pump 8 is used to increase the pressure to the pressure required for liquefaction, and then the fourth heat exchanger 9 is used to exchange heat to the liquefaction temperature.

通过调节第五换热器10冷流股出口换热介质天然气的温度来调节第二泵11出口换热介质水的温度。The temperature of the heat exchange medium water at the outlet of the second pump 11 is adjusted by adjusting the temperature of the heat exchange medium natural gas at the outlet of the cold stream of the fifth heat exchanger 10 .

该工艺最终获取到-20℃、2MPa的液态二氧化碳产品。This process finally obtains a liquid carbon dioxide product at -20°C and 2MPa.

优选的，气态二氧化碳经第一换热器1和第二换热器4的换热后温度均为40℃。Preferably, the temperature of the gaseous carbon dioxide after heat exchange in the first heat exchanger 1 and the second heat exchanger 4 is both 40°C.

换热介质水在第一换热器1、第二换热器4和第四换热器9中分别对二氧化碳流股进行降温、降温、升温作用。In the first heat exchanger 1 , the second heat exchanger 4 and the fourth heat exchanger 9 , the heat exchange medium water cools down, cools down and raises the temperature of the carbon dioxide stream respectively.

相比现有技术，在上述实施例工艺流程下，单位LCO2能耗由1122.44kJ/h降低到947.55kJ/h，单位LCO2换热介质消耗由3.5kg降低到1kg。Compared with the prior art, under the process flow of the above example, the energy consumption per unit of LCO 2 is reduced from 1122.44kJ/h to 947.55kJ/h, and the consumption of heat exchange medium per unit of LCO 2 is reduced from 3.5kg to 1kg.

上述具体实施方式，仅为说明本发明的技术构思和结构特征，目的在于让熟悉此项技术的相关人士能够据以实施，但以上内容并不限制本发明的保护范围，凡是依据本发明的精神实质所作的任何等效变化或修饰，均应落入本发明的保护范围之内。The above-mentioned specific implementation is only to illustrate the technical concept and structural features of the present invention, and the purpose is to allow relevant persons familiar with this technology to implement it accordingly, but the above content does not limit the scope of protection of the present invention. Any equivalent change or modification made in essence shall fall within the protection scope of the present invention.

Claims (10)

1.一种用于二氧化碳中压压缩液化的换热介质循环装置，其特征在于：包括包括气态二氧化碳输送管道(12)、第一换热器(1)、第一压缩机(3)、第二换热器(4)、第二压缩机(6)、第三换热器(7)、第一泵(8)、第四换热器(9)、第二泵(11)及液态二氧化碳输送管道(13)；1. A heat exchange medium circulation device for medium-pressure compression liquefaction of carbon dioxide, characterized in that: it comprises a gaseous carbon dioxide delivery pipeline (12), a first heat exchanger (1), a first compressor (3), a second Second heat exchanger (4), second compressor (6), third heat exchanger (7), first pump (8), fourth heat exchanger (9), second pump (11) and liquid carbon dioxide Delivery pipeline (13); 其中，气态二氧化碳输送管道(12)与第一换热器(1)热流股入口连通，第一换热器(1)热流股出口经过第一压缩机(3)后与所述第二换热器(4)的热流股入口连通，第二换热器(4)的热流股出口经过第二压缩机(6)后与第三换热器(7)热流股入口连通，第三换热器(7)热流股出口经过第一泵(8)后与第四换热器(9)冷流体入口连通，第四换热器(9)冷流体出口与液态二氧化碳输送管道(13)连通；Wherein, the gaseous carbon dioxide delivery pipeline (12) communicates with the hot stream inlet of the first heat exchanger (1), and the hot stream outlet of the first heat exchanger (1) passes through the first compressor (3) and exchanges heat with the second The hot stream inlet of the device (4) is connected, the hot stream outlet of the second heat exchanger (4) is communicated with the hot stream inlet of the third heat exchanger (7) after passing through the second compressor (6), and the third heat exchanger (7) The hot stream outlet is communicated with the cold fluid inlet of the fourth heat exchanger (9) after passing through the first pump (8), and the cold fluid outlet of the fourth heat exchanger (9) is communicated with the liquid carbon dioxide delivery pipeline (13); 第一换热器(1)的冷流股出口与第四换热器(9)的热流体入口连通，第四换热器(9)的热流体出口与第二换热器(4)的冷流股入口连通，第二换热器(4)的冷流股出口经过第二泵(11)后与第一换热器(1)的冷流股入口连通，构成换热介质循环回路。The cold stream outlet of the first heat exchanger (1) communicates with the hot fluid inlet of the fourth heat exchanger (9), and the hot fluid outlet of the fourth heat exchanger (9) communicates with the hot fluid inlet of the second heat exchanger (4). The cold stream inlet is connected, and the cold stream outlet of the second heat exchanger (4) passes through the second pump (11) and communicates with the cold stream inlet of the first heat exchanger (1), forming a heat exchange medium circulation loop. 2.根据权利要求1所述一种用于二氧化碳中压压缩液化的换热介质循环装置，其特征在于：还包括设置在所述第二换热器(4)和第二泵(11)之间的第五换热器(10)，第二换热器(4)冷流股出口连接第五换热器(10)热流体入口，第五换热器(10)热流体出口连接第二泵(11)，第三换热器(7)冷流股出口连接第五换热器(10)冷流股入口。2. A heat exchange medium circulation device for medium-pressure compression liquefaction of carbon dioxide according to claim 1, characterized in that: it also includes a heat exchange medium installed between the second heat exchanger (4) and the second pump (11). Between the fifth heat exchanger (10), the second heat exchanger (4) cold stream outlet is connected to the fifth heat exchanger (10) hot fluid inlet, the fifth heat exchanger (10) hot fluid outlet is connected to the second The pump (11), the cold stream outlet of the third heat exchanger (7) is connected to the cold stream inlet of the fifth heat exchanger (10). 3.根据权利要求1所述一种用于二氧化碳中压压缩液化的换热介质循环装置，其特征在于：还包括第一分离塔(2)，所述第一分离塔(2)设置在所述第一换热器(1)热流股出口和第一压缩机(3)入口之间。3. A heat exchange medium circulation device for medium-pressure compression liquefaction of carbon dioxide according to claim 1, characterized in that: it also includes a first separation tower (2), and the first separation tower (2) is arranged at the Between the hot stream outlet of the first heat exchanger (1) and the inlet of the first compressor (3). 4.根据权利要求1所述一种用于二氧化碳中压压缩液化的换热介质循环装置，其特征在于：还包括第二分离塔(5)，所述第二分离塔(5)设置在所述第二换热器(4)热流股出口和第二压缩机(6)入口之间。4. A heat exchange medium circulation device for medium-pressure compression liquefaction of carbon dioxide according to claim 1, characterized in that: it also includes a second separation tower (5), and the second separation tower (5) is arranged at the Between the hot stream outlet of the second heat exchanger (4) and the inlet of the second compressor (6). 5.根据权利要求1所述一种用于二氧化碳中压压缩液化的换热介质循环装置，其特征在于：所述第三换热器(7)中的换热介质为液态天然气。5. A heat exchange medium circulation device for medium-pressure compression liquefaction of carbon dioxide according to claim 1, characterized in that: the heat exchange medium in the third heat exchanger (7) is liquefied natural gas. 6.根据权利要求1所述一种用于二氧化碳中压压缩液化的换热介质循环装置，其特征在于：所述第一换热器(1)、第二换热器(4)、第四换热器(9)中的换热介质均为水。6. A heat exchange medium circulation device for medium-pressure compression liquefaction of carbon dioxide according to claim 1, characterized in that: the first heat exchanger (1), the second heat exchanger (4), the fourth The heat exchange medium in the heat exchanger (9) is water. 7.一种用于二氧化碳中压压缩液化的换热介质循环工艺，其特征在于：待压缩的二氧化碳气体自气态二氧化碳输送管道(12)进入第一换热器(1)与换热介质水换热后，依次通过第一分离塔(2)、第一压缩机(3)后在第二换热器(4)与换热介质水换热，再依次通过第二分离塔(5)、第二压缩机(6)后在第三换热器(7)与换热介质天然气换热，最后通过第一泵(8)后在第四换热器(9)与换热介质水换热，最后从液态二氧化碳输送管道(13)输出液态二氧化碳；7. A heat exchange medium circulation process for medium-pressure compression liquefaction of carbon dioxide, characterized in that: the carbon dioxide gas to be compressed enters the first heat exchanger (1) from the gaseous carbon dioxide delivery pipeline (12) to exchange with the heat exchange medium water After heating, it passes through the first separation tower (2), the first compressor (3) and exchanges heat with the heat exchange medium water in the second heat exchanger (4), and then passes through the second separation tower (5), the second The second compressor (6) exchanges heat with the heat exchange medium natural gas in the third heat exchanger (7), and finally exchanges heat with the heat exchange medium water in the fourth heat exchanger (9) after passing through the first pump (8). Finally output liquid carbon dioxide from the liquid carbon dioxide delivery pipeline (13); 其中，换热介质水依次经过第一换热器(1)、第四换热器(9)、第二换热器(4)、第五换热器(10)后，经第二泵(11)回到第一换热器(1)形成换热介质水的循环；Wherein, the heat exchange medium water passes through the first heat exchanger (1), the fourth heat exchanger (9), the second heat exchanger (4) and the fifth heat exchanger (10) in sequence, and then passes through the second pump ( 11) return to the first heat exchanger (1) to form the circulation of heat exchange medium water; 换热介质液态天然气进入依次经过第三换热器(7)和第五换热器(10)换热，通过调节第五换热器(10)冷流股出口换热介质天然气的温度从而调节第二泵(11)出口换热介质水的温度。The heat exchange medium liquefied natural gas enters through the third heat exchanger (7) and the fifth heat exchanger (10) for heat exchange in sequence, and the temperature of the heat exchange medium natural gas at the outlet of the cold stream of the fifth heat exchanger (10) is adjusted. The temperature of the heat exchange medium water at the outlet of the second pump (11). 8.根据权利要求7所述一种用于二氧化碳中压压缩液化的换热介质循环工艺，其特征在于：气态二氧化碳经第一压缩机(3)、第二压缩机(6)压缩后，采用第一泵(8)增压至液化所需压力。8. According to claim 7, a heat exchange medium circulation process for medium-pressure compression and liquefaction of carbon dioxide is characterized in that: after the gaseous carbon dioxide is compressed by the first compressor (3) and the second compressor (6), use The first pump (8) is pressurized to the required pressure for liquefaction. 9.根据权利要求7所述一种用于二氧化碳中压压缩液化的换热介质循环工艺，其特征在于：所述液态二氧化碳输送管道(13)中液态二氧化碳温度为-20℃、压力为2MPa。9. A heat exchange medium circulation process for medium-pressure compression and liquefaction of carbon dioxide according to claim 7, characterized in that: the temperature of the liquid carbon dioxide in the liquid carbon dioxide delivery pipeline (13) is -20°C and the pressure is 2MPa. 10.根据权利要求7所述一种用于二氧化碳中压压缩液化的换热介质循环工艺，其特征在于：气态二氧化碳经第一换热器(1)和第二换热器(4)的换热后的温度均为40℃。10. A heat exchange medium circulation process for medium-pressure compression liquefaction of carbon dioxide according to claim 7, characterized in that: gaseous carbon dioxide is exchanged through the first heat exchanger (1) and the second heat exchanger (4). The temperature after heating was all 40°C.
CN202310357469.XA 2023-04-06 2023-04-06 A heat exchange medium circulation device and process for medium-pressure compression liquefaction of carbon dioxide Pending CN116379708A (en)

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