A reboiler heating system coupled with a green electricity heater

Abstract

The application discloses a reboiler heating system coupled with a green electricity heater, which comprises a reboiling heat medium control device, a reboiler, a rectifying tower, an electric heater device and a green electricity coupling control system, the electric heater device is arranged in the rectifying tower, the reboiling heat medium control device is used for controlling the heat medium sent to the reboiler to achieve the purpose of controlling the heat load of the reboiler, the reboiler is used for medium heat exchange, the process medium from the bottom of the rectifying tower is heated by the heat medium entering the reboiler to become ascending steam and then is output, the electric heater device is connected with a green electricity unit, and the green electricity coupling control system is used for adjusting the coupling of the output load of the green electricity unit and the heat load of the reboiler. Through the combination of green electricity heating and traditional heat medium heating, the problem of unstable new energy generation is effectively solved, the equipment land area is reduced, the tower bottom temperature fluctuation problem caused by the lag of heat medium adjustment in the traditional system is solved, and the coking risk is avoided.

Description

Technical Field

[0001] This invention belongs to the field of new energy technology and relates to a reboiler, specifically, a reboiler heating system coupled with a green electric heater. Background Technology

[0002] Globally, with increasing environmental awareness, green electricity, especially wind and solar power, is receiving widespread attention and vigorous development due to its significant advantages of being clean, low-carbon, zero-emission, and abundant in resources. However, with the rapid advancement of new energy power generation technologies such as wind and solar power and the dramatic increase in installed capacity, the high proportion of new energy connected to the grid has brought unprecedented challenges and requirements to the power system. The rapid increase in the proportion of new energy power generation has directly led to the increasingly prominent problem of energy structure mismatch and the power system stability risks caused by an excessively high proportion of green electricity generation capacity.

[0003] Specifically, renewable energy generation such as wind and solar power is greatly affected by natural conditions, resulting in intermittent and unstable power output. This makes it highly susceptible to "wind curtailment" and "solar curtailment," meaning that when renewable energy generation is in excess and the grid cannot absorb it all, some renewable energy has to be abandoned. At the same time, user electricity demand exhibits significant peak-valley characteristics. While existing green energy storage technologies employ methods such as chemical energy storage batteries for energy regulation, they are limited by short storage time and high costs, making it difficult to meet the demand for green energy consumption during peak periods. This exacerbates the severity of the "wind curtailment" and "solar curtailment" problems.

[0004] Furthermore, conventional refineries, as major energy consumers, still rely heavily on fossil fuels in their energy structure. However, with the increasing proportion of new energy sources, how to effectively utilize green electricity in conventional refineries and achieve the coupled utilization of green electricity and fossil fuels has become a crucial issue that urgently needs to be addressed in the energy sector. On the one hand, refineries have stable heat load demands, which provides ample room for the utilization of green electricity; on the other hand, the introduction of green electricity can reduce refineries' fossil fuel consumption, reduce carbon emissions, and achieve green, low-carbon, and sustainable development goals.

[0005] In summary, current green energy sources such as wind and solar power have significant limitations in grid integration, and the problems of "curtailment of solar power" and "curtailment of wind power" urgently need to be addressed. However, the coupling technology between green energy and fossil fuels from refineries provides a new approach and direction for solving this problem. Summary of the Invention

[0006] To address the problems of low green electricity consumption efficiency, strong dependence on fossil fuels, and insufficient dynamic adjustment capability of heat load in existing technologies, this invention provides a reboiler heating system coupled with a green electricity heater.

[0007] This invention provides a reboiler heating system coupled with a green electric heater. The heating system includes a reboiler heat medium control device, a reboiler, a distillation column, an electric heater device, and a green-electric coupling control system. The electric heater device is located inside the distillation column. The reboiler heat medium control device controls the heat medium supplied to the reboiler to control the reboiler's heat load. The electric heater device electrically heats the process medium inside the distillation column. The reboiler is used for medium heat exchange, relying on the heat medium entering the reboiler to heat the process medium exiting from the bottom of the distillation column, causing it to rise as steam before being output. The electric heater device is connected to a green electric generator unit. The green-electric coupling control system adjusts the coupling between the green electric generator unit's output load and the reboiler's heat load.

[0008] The electric heater is fixedly installed inside the distillation column. The flange of the electric heater is tightly connected to the flange on the column wall with bolts. At the connection, a sealing gasket is used to ensure good sealing. Alternatively, an insertion installation can be used, in which the electric heater is directly inserted into the liquid phase inside the distillation column by making a proper installation hole in the column wall. This method can be used when the pressure inside the distillation column is not high. Other fixed installation methods, such as welding installation, can also be used.

[0009] The electric heater device includes one or more sets of electric heaters, with the sets of electric heaters connected in parallel. The electric heaters are any one or more combinations of electric heating wire heaters, electric heating film heaters, and electric heating tube heaters.

[0010] The ratio of the heating load of the electric heater to the heat load of the reboiler is no greater than 1:2, preferably 1:1. The green motor unit includes, but is not limited to, wind turbine units, photovoltaic units, etc.

[0011] The reboiler heat medium control device includes a main heat medium regulating valve and a bypass regulating valve.

[0012] The green-electric coupling control system includes a monitoring module and a control module. The monitoring module is used to monitor state parameters such as the rising steam output from the distillation column. The control module is used to control the output load of the green generator unit and the heat load of the reboiler based on the parameters of the rising steam monitored by the monitoring module.

[0013] The monitoring module includes a pressure gauge and / or a temperature gauge for the rising steam after the medium inside the tower is heated. The pressure gauge is used to monitor the pressure of the medium inside the tower after it is heated, and the temperature gauge is used to monitor the temperature of the medium inside the tower after it is heated. The control module controls the output load of the green generator set and the flow rate of the reboiler heat medium according to the pressure and / or temperature of the rising steam of the heated medium.

[0014] The advantages of this invention compared to the prior art are:

[0015] 1) The electric heating device of the present invention has the ability to absorb a portion of green electricity. By combining green electricity heating with traditional heat medium heating, it effectively solves the problem of unstable new energy power generation. While ensuring that green electricity can be absorbed in a large proportion, it ensures that new energy is efficiently connected to the grid, significantly reduces the frequency of wind and solar curtailment, and greatly reduces the consumption of traditional fossil fuels.

[0016] 2) The distillation column adopts a structural design with an electric heater built in. The built-in electric heater replaces the external heat exchange unit, reducing the equipment footprint. Combined with the reboiler heat medium flow dynamic matching system, the process medium is directly heated to reduce heat transfer loss, solve the problem of bottom temperature fluctuation caused by the lag in heat medium regulation in traditional systems, and avoid the risk of coking.

[0017] 3) Integrate green electricity load with a multi-parameter coupled control system. By monitoring green electricity fluctuations, tower bottom temperature and changes in raw material composition in real time, dynamically adjust the ratio of electric heating power to heat medium flow rate to ensure precise matching between heat load input and process requirements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] In the diagram: 1-Reboiler heat medium control device; 2-Reboiler; 3-Distillation column; 4-Electric heater device; 5-Green electric coupling control system; 1-1-Main regulating valve; 1-2-Bypass regulating valve. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings.

[0021] like Figure 1 As shown, this invention discloses a reboiler heating system with a built-in green electric heater in a coupled column. The system includes a reboiler heat medium control device 1, a reboiler 2, a distillation column 3, and an electric heater device 4 and a green electric coupling control system 5 installed inside the reboiler. The reboiler heat medium control device 1 controls the flow rate of the reboiler heat medium, which is delivered to the reboiler via a regulating valve to control the reboiler heat load. The electric heater device is used to electrically heat the process medium in the distillation column. The bottom liquid in the distillation column 3 is heated into a gas-liquid two-phase state by the reboiler before returning to the distillation column 3 to form a reboiler loop. The green electric coupling control system is used to adjust the output load of the green electric heater unit and the heat load of the reboiler to couple the heating of the medium in the distillation column.

[0022] A built-in electric heater 4 is fixedly installed inside the distillation column 3. This built-in electric heater 4 can directly heat the liquid phase at the bottom of the distillation column, which can replace part of the external heat medium consumption used in the external reboiler. In this embodiment, the built-in electric heater 4 is directly connected to a green power unit.

[0023] With my country's vigorous promotion of new energy development, wind and solar energy, among others, are gradually increasing their share in the energy sector due to their advantages of being clean, low-carbon, pollution-free, and abundant. However, power generation systems based primarily on new energy sources suffer from instability due to the intermittency and volatility of wind and solar energy, leading to frequent instances of wind and solar power curtailment.

[0024] The electric heating device inside the distillation tower is connected to green power units, including but not limited to wind turbines and solar power units. The electric heating device has the ability to absorb a portion of green electricity. By combining green electricity heating with traditional heat transfer medium heating, it effectively solves the problem of unstable new energy power generation. While ensuring a large proportion of green electricity is absorbed, it also ensures efficient grid connection of new energy sources and significantly reduces the frequency of wind and solar curtailment.

[0025] The ratio of the heating load of the built-in electric heater device 4 to the heat load of the external reboiler is no greater than 1:2, preferably 1:1.

[0026] The built-in electric heater 4 of the distillation column 3 is fixedly installed inside the column. The flange of the electric heater and the flange on the column wall can be tightly connected using bolts. Sealing gaskets can be used at the connection points to ensure good sealing. Alternatively, an insertion installation can be used, where a suitable mounting hole is made in the column wall, and the heater is directly inserted into the liquid phase inside the distillation column. This method can be used when the pressure inside the distillation column is not high. Other fixed installation methods, such as welding installation, can also be used, and this disclosure does not specifically limit the methods.

[0027] The electric heater is any one or more combinations of electric heating wire heater, electric heating film heater, and electric heating tube heater.

[0028] The reboiler heat medium control device 1 includes a main heat medium regulating valve 1-1 and a bypass regulating valve 1-2. The reboiler outlet temperature control loop uses split-range control to regulate the opening of the main regulating valve 1-1 and the bypass regulating valve 1-2, thereby controlling the flow rate of the heat medium in the external reboiler pipeline. After sufficient heat exchange with the bottom liquid phase in the reboiler, the reboiler heat medium enters the distillation column as rising steam.

[0029] The reboiler heating system includes a green electric coupling control system, which includes a monitoring module and a control module. The green electric coupling control system heats the medium inside the distillation column by adjusting the output load of the green generator set and the heat load of the reboiler.

[0030] The distillation column and reboiler are equipped with monitoring modules to monitor parameters such as the rising steam output from the distillation column. The control module is used to control the output load of the green generator unit and the heat load of the reboiler based on the parameters of the rising steam monitored by the monitoring module.

[0031] The monitoring module includes a pressure gauge and / or a temperature gauge for the rising steam after the medium inside the tower is heated. The pressure gauge is used to monitor the pressure of the medium inside the tower after it is heated, and the temperature gauge is used to monitor the temperature of the medium inside the tower after it is heated. The control module controls the green motor unit to output a frequency conversion signal to control the electric heating load and the flow rate of the reboiler heat medium based on the pressure and / or temperature of the rising steam of the heated medium.

[0032] A monitoring module is connected to the output of the distillation column and the external reboiler. This module monitors parameters such as the rising steam output from the distillation column. The system also includes a control module, which controls the output load of the green generator set and the heat load of the reboiler based on the parameters of the rising steam after the medium inside the column is heated, as monitored by the monitoring module. Specifically, the monitoring module includes a pressure gauge and / or a temperature gauge for the rising steam after the medium inside the column is heated. The pressure gauge monitors the pressure of the medium after heating, and the temperature gauge monitors the temperature of the medium after heating. The control module controls the output load of the green generator set and the flow rate of the reboiler's heating medium based on the pressure and / or temperature of the rising steam of the heated medium.

[0033] The above descriptions are merely typical examples of the present invention and do not impose any limitations on the present invention. Any changes or modifications made by those skilled in the art using the above technical content without departing from the scope of the present invention should be considered equivalent examples of equivalent variations. Any equivalent changes made to the above examples based on the technical essence of the present invention without departing from the content of the present invention are within the scope of the present invention.

Claims

1. A reboiler heating system coupled with a green electric heater, characterized in that: The heating system includes a reboiling heat medium control device, a reboiler, a distillation column, an electric heater device, and a green-electric coupling control system. The electric heater device is located inside the distillation column. The reboiling heat medium control device is used to control the heat medium sent to the reboiler to control the heat load of the reboiler. The electric heater device is used to electrically heat the process medium in the distillation column. The reboiler is used for medium heat exchange. It relies on the heat medium entering the reboiler to heat the process medium coming out from the bottom of the distillation column, turning it into rising steam before output. The electric heater device is connected to a green generator set. The green-electric coupling control system is used to adjust the coupling between the output load of the green generator set and the heat load of the reboiler.

2. The reboiler heating system with coupled green electric heater according to claim 1, characterized in that: The electric heater is fixedly installed inside the distillation column. The flange of the electric heater is tightly connected to the flange on the column wall by bolts. At the connection point, a sealing gasket is used to ensure good sealing.

3. The reboiler heating system with coupled green electric heater according to claim 1, characterized in that: When the pressure inside the distillation column is not high, an insertion type installation is adopted. The electric heater is directly inserted into the liquid phase inside the distillation column by opening a suitable installation hole in the column wall.

4. The reboiler heating system with coupled green electric heater according to claim 1, characterized in that: The electric heater device is welded and installed inside the distillation column.

5. The reboiler heating system with coupled green electric heater according to claim 1, characterized in that: The electric heater device includes one or more sets of electric heaters, with the sets of electric heaters connected in parallel. The electric heaters are any one or more combinations of electric heating wire heaters, electric heating film heaters, and electric heating tube heaters.

6. The reboiler heating system with coupled green electric heater according to claim 1, characterized in that: The ratio of the heating load of the electric heater to the heat load of the reboiler is no greater than 1:2, and the green motor unit includes, but is not limited to, wind turbine unit and photovoltaic unit.

7. The reboiler heating system with coupled green electric heater according to claim 1, characterized in that: The ratio of the heating load of the electric heater to the heat load of the reboiler is 1:1, and the green motor unit includes, but is not limited to, wind turbine units and photovoltaic units.

8. The reboiler heating system with coupled green electric heater according to claim 1, characterized in that: The reboiler heat medium control device includes a main heat medium regulating valve and a bypass regulating valve.

9. The reboiler heating system with coupled green electric heater according to claim 1, characterized in that: The green-electric coupling control system includes a monitoring module and a control module. The monitoring module is used to monitor state parameters such as the rising steam output from the distillation column. The control module is used to control the output load of the green generator unit and the heat load of the reboiler based on the parameters of the rising steam monitored by the monitoring module.

10. The reboiler heating system with coupled green electric heater according to claim 9, characterized in that: The monitoring module includes a pressure gauge and a temperature gauge for the rising steam after the medium inside the tower is heated. The pressure gauge is used to monitor the pressure of the medium inside the tower after it is heated, and the temperature gauge is used to monitor the temperature of the medium inside the tower after it is heated. The control module controls the output load of the green generator set and the flow rate of the reboiler heat medium according to the pressure or temperature of the rising steam of the heated medium.

Images