Carbon capture system integrated with industrial steam supply and working method of carbon capture system

Abstract

The invention belongs to the field of carbon dioxide capture, discloses a carbon capture system integrating industrial steam supply and a working method of the carbon capture system, and aims to solve the problems that the industrial steam supply capacity is insufficient, the energy consumption of a traditional carbon capture process is large, and heat is wasted due to low grade. The system comprises a carbon capture link, a high-temperature compressor, a motor, a preheater, an evaporator, a steam pocket, a superheater, an industrial steam user, a water pump, a cooler, a heat supply system, a condenser, a refrigerator and a storage and transportation system, the original carbon capture compressor is replaced by the high-temperature compressor, the exhaust temperature of the compressor can reach 300-500 DEG C, condensed water is heated by high-temperature and high-pressure carbon dioxide, and the condensed water is stored in the storage and transportation system. The generated industrial steam can be used by a user and can also be used by a heating user, and then carbon dioxide is sealed and utilized. According to the invention, carbon dioxide capture is realized, industrial steam and heating are provided, gradient utilization of energy is realized, comprehensive energy consumption is reduced, and the problems of insufficient supply of industrial steam and high energy consumption of carbon capture are solved.

Description

Technical Field

[0001] This invention belongs to the field of carbon dioxide capture, and specifically relates to a carbon capture system with integrated industrial steam supply and its working method. Background Technology

[0002] With the large-scale grid connection of new energy sources, the power grid system faces enormous regulation pressure. Coal-fired power units, as the main force of power generation, require deep peak shaving or even start-stop peak shaving. When coal-fired power units are operating at low load, the steam extraction and heating capacity decreases significantly. Meanwhile, thermal power plants often undertake the task of providing industrial steam and winter heating for nearby industries. In recent years, how to improve the supply capacity of industrial steam and heating in thermal power plants has become the focus of transformation and upgrading. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a carbon capture system and its operating method that integrates industrial steam supply, thereby solving the problems of insufficient industrial steam supply capacity, low compressor exhaust temperature, high energy consumption in traditional carbon capture processes, and wasted heat due to low grade.

[0004] To achieve the objective of this invention, the technical solution adopted is as follows: A carbon capture system for integrated industrial steam supply, comprising: a carbon capture stage 1, a high-temperature compressor 2, an electric motor 3, a preheater 4, an evaporator 5, a steam drum 6, a superheater 7, an industrial steam user 8, a water pump 9, a cooler 10, a heating system 11, a condenser 12, a chiller 13, and a storage and transportation system 14.

[0005] The carbon capture stage 1 is connected to the high-temperature compressor 2. The outlet of the high-temperature compressor 2 is connected to the cooler 10 via the heater 7, evaporator 5 and preheater 4. The cooler 10 is connected to the storage and transportation system 14 via the condenser 12.

[0006] Furthermore, the high-temperature compressor 2 is equipped with an electric motor 3.

[0007] Furthermore, the industrial steam user 8 is connected in sequence to the preheater 4, evaporator 5 and superheater 7 via the water pump 9, and the superheater 7 is then connected to the industrial steam user 8 to form a circulation loop.

[0008] Among them, a steam drum 6 is provided after the evaporator 5.

[0009] Furthermore, the cooler 10 is connected to the heating system 11.

[0010] Among them, the heating system 11 is preferably a heating user or a cooling tower.

[0011] Furthermore, the condenser 12 is connected to the chiller 13.

[0012] Among them, the storage and transportation system 14 is preferably a storage tank or a long-distance pipeline.

[0013] Further, when the ambient temperature is lower than the current carbon dioxide liquefaction temperature, the integrated industrial steam supply carbon capture system provided by the application does not configure a cold machine.

[0014] Further, when the industrial user backwater temperature is lower than 30℃, no cooling tower is configured, no waste heat of the carbon dioxide after the preheater can be utilized, and no heating user exists.

[0015] Working method of the integrated industrial steam supply carbon capture system: (1) The carbon dioxide of the carbon capture link 1 is driven by the electric motor 3 to enter the high-temperature compressor 2 for adiabatic compression, the high-temperature and high-pressure carbon dioxide at the outlet of the high-temperature compressor 2 is sequentially passed through the superheater 7, the evaporator 5 and the preheater 4 to heat the condensate water to generate industrial steam to power the industrial steam user 8. Among them, the adiabatically compressed carbon dioxide is 300℃-500℃. Among them, the pressure of the adiabatically compressed carbon dioxide is 2MPa.a-15MPa.a.

[0016] (2) The condensate water comes from the backwater of the industrial steam user 8, is pressurized by the water pump 9, and is sequentially heated by the adiabatically compressed carbon dioxide in the preheater 4, the evaporator 5 and the superheater 7. Among them, the backwater pressure after being pressurized by the water pump 9 is 0.5MPa.a-5MPa.a.

[0017] (3) The evaporator 5 is provided with the steam drum 6 for storing a part of the steam to play a buffering role, to ensure the stable operation of the system and the parameters of the steam, and the generated industrial steam enters the pipe network to be used by the user.

[0018] (4) The carbon dioxide after heating the condensate water still has certain waste heat, which is further transmitted to the heating system 11 by the cooler 10.

[0019] (5) The carbon dioxide after heating enters the condenser 12, is condensed to a liquid state or a high-density state by the cold water generated by the cold machine 13, and enters the storage and transportation system 14 for storage and utilization.

[0020] By adopting the above technical scheme, the following beneficial effects are achieved: 1. The integrated industrial steam supply carbon capture system provided by the application uses one high-temperature compressor to replace the multiple carbon capture compressors in the original carbon capture process, the configuration and start-stop operation control of the compression system are simpler, and the initial investment of the compressor can be saved.

[0021] 2. The high-temperature compressor converts electric energy into heat energy, which is equivalent to a heat pump cycle, and the COP exceeds 1. Under the same power consumption, the heat production efficiency is much higher than that of the direct electric heating method, and the energy conversion efficiency is high.

[0022] 3. This invention combines the carbon capture process with the industrial steam supply process, realizing two functions in one system, and simultaneously solving the problems of insufficient industrial steam supply and high energy consumption of carbon capture in thermal power plants.

[0023] In summary, this invention proposes a carbon capture system technology integrating industrial steam supply. It replaces the original intercooled carbon capture compressor with a high-temperature compressor that is not intercooled. The compressor exhaust temperature can reach 400°C. The high-temperature, high-pressure carbon dioxide at the compressor outlet heats the condensate to generate industrial steam for user use. The cooled carbon dioxide still retains some residual heat, which can be used for heating. The carbon dioxide is then stored in a liquid tank or transported via long-distance pipelines for carbon dioxide sequestration and utilization. This invention achieves carbon dioxide capture while providing industrial steam and heating, enabling cascaded energy utilization, reducing overall energy consumption, and solving the problems of insufficient industrial steam supply and high energy consumption in carbon capture. Attached Figure Description

[0024] Figure 1 A schematic diagram of the integrated industrial steam supply carbon capture system provided by the present invention; In the diagram: 1-Carbon capture stage, 2-High temperature compressor, 3-Electric motor, 4-Preheater, 5-Evaporator, 6-Steam drum, 7-Superheater, 8-Industrial steam user, 9-Water pump, 10-Cooler, 11-Heating system, 12-Condenser, 13-Chiller, 14-Storage and transportation system. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] Example 1 A carbon capture system for integrated industrial steam supply, comprising: a carbon capture stage, a high-temperature compressor, an electric motor, a preheater, an evaporator, a steam drum, a superheater, an industrial steam user, a water pump, a cooler, a heating user, a condenser, a chiller, and a storage tank.

[0027] The carbon capture stage is connected to a high-temperature compressor. The outlet of the high-temperature compressor is connected to a cooler via a heater, evaporator, and preheater. The cooler is connected to a storage tank via a condenser. The high-temperature compressor is equipped with an electric motor. A steam drum is located after the evaporator. The cooler is connected to the heating user. The condenser is connected to the chiller.

[0028] The condensate from industrial steam users is sequentially connected to the preheater, evaporator, and superheater via a water pump. The superheater is then connected to the industrial steam user, forming a circulation loop.

[0029] Example 2 How a carbon capture system with integrated industrial steam supply works: The carbon dioxide from the carbon capture stage is driven by an electric motor and enters a high-temperature compressor for adiabatic compression. The high-temperature and high-pressure carbon dioxide from the high-temperature compressor outlet passes through a superheater, evaporator, and preheater in sequence to heat the condensate and generate industrial steam to power industrial steam users. In this embodiment, the adiabatic compressed carbon dioxide is 300°C and has a pressure of 2 MPa.a.

[0030] The condensate comes from the return water of industrial steam users. After being pressurized by a water pump, it enters the preheater, evaporator, and superheater in sequence and is heated by adiabatic compressed carbon dioxide. A steam drum is set after the evaporator to store a portion of the steam, which acts as a buffer to ensure the stability of system operation and steam parameters. The industrial steam generated is then supplied to users through the pipeline network. The carbon dioxide, after heating the condensate, still has some residual heat, so it enters the cooler to further transfer the heat to heating users. The carbon dioxide after heating then enters the condenser, where it is condensed into a liquid state by the chilled water generated by the chiller and then stored in a storage tank for future use.

[0031] Example 3 A carbon capture system for integrated industrial steam supply, comprising: a carbon capture stage, a high-temperature compressor, an electric motor, a preheater, an evaporator, a steam drum, a superheater, an industrial steam user, a water pump, a cooler, a cooling tower, a condenser, a chiller, and a long-distance pipeline.

[0032] The carbon capture stage is connected to a high-temperature compressor. The outlet of the high-temperature compressor is connected to a cooler via a heat exchanger, an evaporator, and a preheater. The cooler is connected to a long-distance pipeline via a condenser. The high-temperature compressor is equipped with an electric motor. A steam drum is located after the evaporator. The cooler is connected to a cooling tower. The condenser is connected to a chiller.

[0033] The condensate from industrial steam users is sequentially connected to the preheater, evaporator, and superheater via a water pump. The superheater is then connected to the industrial steam user, forming a circulation loop.

[0034] Example 4 How a carbon capture system with integrated industrial steam supply works: The carbon dioxide from the carbon capture stage is driven by an electric motor and enters a high-temperature compressor for adiabatic compression. The high-temperature and high-pressure carbon dioxide from the high-temperature compressor outlet passes through a superheater, evaporator, and preheater in sequence to heat the condensate and generate industrial steam to power industrial steam users. In this embodiment, the adiabatic compressed carbon dioxide is 500°C and has a pressure of 15 MPa.a.

[0035] The condensate comes from the return water of industrial steam users. After being pressurized by a water pump, it enters the preheater, evaporator, and superheater in sequence and is heated by adiabatic compressed carbon dioxide. A steam drum is set after the evaporator to store a portion of the steam, which acts as a buffer to ensure the stability of system operation and steam parameters. The industrial steam generated enters the pipeline network for users. The carbon dioxide that has been heated by the condensate cooling tower still has some residual heat, so it enters the cooler to further transfer the heat to the cooling tower. The heated carbon dioxide then enters the condenser, where it is condensed to a high-density state by the chilled water generated by the chiller and enters the long-distance pipeline.

[0036] Example 5 A carbon capture system for integrated industrial steam supply without a chiller, provided that the ambient temperature is below the current carbon dioxide liquefaction temperature. The system includes: a carbon capture stage, a high-temperature compressor, an electric motor, a preheater, an evaporator, a steam drum, a superheater, an industrial steam user, a water pump, a cooler, a cooling tower, a condenser, and a long-distance pipeline.

[0037] The carbon capture stage is connected to a high-temperature compressor. The outlet of the high-temperature compressor is connected to a cooler via a heat exchanger, an evaporator, and a preheater. The cooler is connected to a long-distance pipeline via a condenser. The high-temperature compressor is equipped with an electric motor. A steam drum is located after the evaporator. The cooler is connected to a cooling tower.

[0038] The condensate from industrial steam users is sequentially connected to the preheater, evaporator, and superheater via a water pump. The superheater is then connected to the industrial steam user, forming a circulation loop.

[0039] Example 6 When the return water temperature of industrial users is below 30°C, an integrated industrial steam supply carbon capture system without a cooling tower is provided. The system includes: a carbon capture stage, a high-temperature compressor, an electric motor, a preheater, an evaporator, a steam drum, a superheater, an industrial steam user, a water pump, a cooler, a condenser, a chiller, and a storage tank.

[0040] The carbon capture stage is connected to a high-temperature compressor. The outlet of the high-temperature compressor is connected to a cooler via a heat exchanger, an evaporator, and a preheater. The cooler is connected to a storage tank via a condenser. The high-temperature compressor is equipped with an electric motor. A steam drum is located after the evaporator. The condenser is connected to a chiller.

[0041] The condensate from industrial steam users is sequentially connected to the preheater, evaporator, and superheater via a water pump. The superheater is then connected to the industrial steam user, forming a circulation loop.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An integrated industrial steam supply carbon capture system, characterized in that, It comprises: a carbon capture link (1), a high-temperature compressor (2), a motor (3), a preheater (4), an evaporator (5), a steam drum (6), a superheater (7), an industrial steam user (8), a water pump (9), a cooler (10), a heating system (11), a condenser (12), a cooling machine (13), a storage and transportation system (14); the carbon capture link (1) is connected to the high-temperature compressor (2), the outlet of the high-temperature compressor (2) is connected to the cooler (10) through the superheater (7), the evaporator (5) and the preheater (4), and the cooler (10) is connected to the storage and transportation system (14) through the condenser (12); the high-temperature compressor (2) is provided with a motor (3); the industrial steam user (8) is sequentially connected to the preheater (4), the evaporator (5) and the superheater (7) through the water pump (9), and the superheater (7) is connected to the industrial steam user (8) to form a circulating loop; the evaporator (5) is provided with a steam drum (6) after it; the cooler (10) is connected to the heating system (11), and the condenser (12) is connected to the cooling machine (13).

2. The integrated industrial steam supplied carbon capture system of claim 1, wherein: The heating system (11) is a heating user or a cooling tower.

3. The integrated industrial steam supplied carbon capture system of claim 1, wherein: The storage and transportation system (14) is a storage tank or a long-distance pipeline.

4. A method of operating an integrated industrial steam supplied carbon capture system as claimed in any one of claims 1 to 3, characterised in that, It comprises the following steps: (1) The carbon dioxide in the carbon capture link is driven by the motor, enters the high-temperature compressor for adiabatic compression, and the high-temperature and high-pressure carbon dioxide at the outlet of the high-temperature compressor is sequentially heated by the superheater, the evaporator and the preheater to generate industrial steam for the industrial steam user; (2) The condensate water from the industrial steam user is pressurized by the water pump and then sequentially enters the preheater, the evaporator and the superheater to be heated by the adiabatically compressed carbon dioxide; (3) The evaporator is provided with a steam drum after it, which is used to store a part of the steam and plays a buffering role to ensure the stable operation of the system and the parameters of the steam, and the generated industrial steam enters the pipe network for use by the user; (4) The carbon dioxide after heating the condensate water still has a certain residual heat, which enters the cooler to further transfer the heat to the heating system; (5) The carbon dioxide after heating enters the condenser, is condensed to a liquid state or a high-density state by the cold water generated by the cooling machine, and enters the storage and transportation system for storage and utilization.

5. A method of operating an integrated industrial steam supplied carbon capture system according to claim 4, characterized by: The adiabatically compressed carbon dioxide in step (1) is at a temperature of 300-500℃.

6. The method of operating an integrated industrial steam supplied carbon capture system of claim 4, wherein: The adiabatically compressed carbon dioxide in step (1) is at a pressure of 2-15 MPa.a.

7. The method of operating an integrated industrial steam supplied carbon capture system of claim 4, wherein: The backwater pressure after pressurization by the water pump in step (2) is 0.5-5 MPa.a.

8. An integrated industrial steam supplied carbon capture system as claimed in claim 1, characterized by: When the ambient temperature is lower than the current carbon dioxide liquefaction temperature, the carbon capture system does not configure a cooling machine.

9. An integrated industrial steam supplied carbon capture system as claimed in claim 1, characterized by: When the backwater temperature of the industrial user is lower than 30℃, the carbon capture system does not configure a cooling tower.

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