A method for comprehensive utilization of energy in petrochemical industrial areas

Abstract

This invention discloses a method for comprehensive energy utilization in a petrochemical industrial zone, relating to the field of comprehensive energy configuration in petrochemical industrial zones. The energy system includes a heating and cooling system, a CCHP system, a CFB system, a park wind power system, an industrial zone photovoltaic power generation system, and an electric energy storage system. This method utilizes the low power consumption and rapid startup characteristics of gas turbines to maximize safe production in the industrial zone. Furthermore, the CFB circulating fluidized bed boiler utilizes a wide range of fuels, consuming inexpensive coal gangue and combustible waste generated by the park's petrochemical processes, thereby maximizing the stability and economic efficiency of steam supply to the industrial zone.

Description

Technical Field

[0001] The present invention relates to the field of comprehensive energy configuration in petrochemical industrial zones, and in particular to a comprehensive energy utilization method in petrochemical industrial zones in which multiple energy sources complement each other. Background Art

[0002] Currently, large-scale petrochemical industrial parks in China require large quantities of industrial extraction steam and electricity. Petrochemical production is a high-risk process, requiring extremely high quality for both electricity and steam supply, and power outages are generally unacceptable. Furthermore, the petrochemical industry generates large quantities of flammable gases and combustibles. If these waste products are not fully utilized and disposed of, they will pollute the environment. After the industrial steam is used, it is recycled as industrial exhaust steam, using the waste heat to first power heat pump units and then generate air conditioning water. The heat dissipation wastewater enters the energy center's chemical water production system, where it is reprocessed and recycled into demineralized water. The industrial park's coastal location, with its high wind speeds, facilitates the installation of wind turbines. Rooftops and vacant areas within the park also provide suitable space for photovoltaic installations. The concentrated concentration of enterprises in the petrochemical park facilitates the centralized four-generation and three-recycling system. Further optimizing the region's energy allocation structure, enhancing centralized heating capacity and achieving combined heat, power, and cooling, recycling combustible waste generated by the park's chemical industry and co-firing it with coal to reduce waste generation, utilizing vacant space and buildings in the park to develop wind and solar energy, and adding park energy storage to further optimize the park's power supply reliability, ultimately achieving self-powered black starts. This will not only effectively promote energy conservation and emission reduction, protect the environment, alleviate power shortages, and improve energy utilization, but also help enhance the industrial zone's investment environment and the city's quality and quality. This is in line with national energy industry policy and represents a nationally encouraged development direction for modern industrial parks. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a method for comprehensive energy utilization that is rationally designed and capable of implementing the policy of energy conservation and emission reduction.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problem is: a method for comprehensive energy utilization in a petrochemical industrial zone, characterized in that: the energy system includes a heating and cooling system, a CCHP system, a CFB system, a park wind power system, an industrial zone photovoltaic power generation system and an electric energy storage system;

[0005] The heating and cooling system includes a heat pump system, an absorption refrigeration system, a petrochemical industry exhaust steam recovery pipeline and a heating and cooling air intake pipeline;

[0006] The CCHP system includes a gas turbine, a gas turbine generator, a waste heat boiler, a back-pressure steam turbine, and an extraction industrial steam supply pipeline, as well as power generation and distribution lines, and an auxiliary steam pipeline to the CFB system (a plant-wide public steam system).

[0007] The CFB system includes a circulating fluidized bed boiler, an extraction back-pressure steam turbine, a steam turbine generator and an extraction industrial steam supply pipeline, as well as power generation and distribution lines and auxiliary steam pipelines to the CCHP system;

[0008] The park wind power system includes wind turbines that are densely distributed throughout the park and are used to collect and boost the power supply to the park;

[0009] The photovoltaic power generation system in the industrial park includes rooftop photovoltaic power generation in the petrochemical industrial park, coal shed photovoltaic power generation, and photovoltaic power generation for park lighting, which is rectified and boosted before being connected to the park power supply system.

[0010] The electric energy storage system includes a battery system, a power conversion system, a battery management system and a monitoring system;

[0011] The heating and cooling system: In the initial startup phase, since the petrochemical industry exhaust steam pipeline has no recyclable working fluid, a CCHP system or CFB system is used to generate steam to supply the heat pump and absorption chiller. When the petrochemical industry exhaust steam pipeline has recyclable working fluid, the system switches to the petrochemical industry exhaust steam pipeline to provide heating, cooling and air-conditioning water for enterprises in the industrial zone.

[0012] The CCHP system uses external natural gas when no petrochemical enterprises produce combustible gas in the initial startup phase. When the petrochemical enterprises produce combustible gas during the oil refining process, the combustible gas is recovered, purified, and pressurized before being provided to the gas turbine for mixed use. The generated electricity is then used to supply the CFB system with power and electricity to related users in the park during the initial startup phase. The waste heat boiler generates steam that is used to generate electricity through a back-pressure turbine. The back-pressure unit extracts gas as industrial steam and also provides the CFB system auxiliary steam pipeline with a steam source for the initial startup phase.

[0013] The CFB system: The circulating fluidized bed absorbs the combustibles produced by the park and burns them with coal to generate steam to drive the exhaust-type back-pressure steam turbine generator set, which not only supplies power to the park but also provides a continuous supply of industrial steam for the petrochemical project.

[0014] The park wind power system: according to the geographical location of the petrochemical industrial park, wind turbines are arranged to provide power to the park;

[0015] The photovoltaic power generation system in the industrial park: photovoltaic panels are laid according to the surface conditions of the park's roofs, coal sheds, ash storage and other building objects to provide electricity for the park;

[0016] The electric energy storage system is used to achieve peak load shaving and valley filling of electricity consumption, storing wind and solar power and then transferring it to other time periods, stabilizing the frequency of power supply in the park, and improving the safe and efficient operation and lifespan of the park's power generation and power-consuming equipment. That is, the power plant charges the battery during periods of low load and releases the stored power during periods of peak load. When the external power supply is lost, the electric energy storage system can be used to achieve a black start.

[0017] Operation method: The EMC energy management system is used to conduct comprehensive energy control of the park's wind power system, industrial park photovoltaic power generation system, CCHP system, CFB system and electric energy storage system. In the early stage, the park's power supply is provided by an external power supply network or the park's wind power system, industrial park photovoltaic power generation system and electric energy storage system. After the CCHP system is gradually started, it can provide auxiliary steam for startup and the starting power required for startup for the CFB system, and provide gas source for petrochemical industry steam supply. After the heating and cooling system and CFB system are started normally, steam is generated to supply steam and electricity to the petrochemical industry, while absorbing and consuming combustibles generated by petrochemicals; the industrial exhaust steam generated by the petrochemical project is sent to the heating and cooling system for heating and cooling to provide air-conditioning water for the park, and after cooling, it is sent to the chemical water production system for recycling.

[0018] Compared with existing technologies, this invention offers the following advantages and benefits: To ensure safe and reliable petrochemical production while reducing energy consumption, this invention leverages the characteristics of multiple power production processes to achieve diverse and complementary energy sources. Based on the Tianjin Nangang Industrial Park as a design prototype, this invention proposes a rationally designed, efficient energy utilization solution. This ensures the safety and economic efficiency of the park's heating and power supply, while also recovering combustible gases and combustible waste generated by the petrochemical park, providing the park with a four-pronged power supply and three-pronged recovery system. Furthermore, leveraging the Nangang Petrochemical Park's strategically located wind turbines and photovoltaic panels installed on park buildings, it provides power to the park and supplements the starting power of gas-fired units, enabling isolated black starts in the petrochemical park. By leveraging the low starting power requirements and rapid startup of gas turbines, this approach maximizes safe production in the industrial park. Leveraging the CFB circulating fluidized bed boiler's wide fuel range, it consumes inexpensive coal gangue and combustible waste generated by the park's petrochemical processes, maximizing the stability and economic efficiency of the park's industrial steam supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0020] In the figure: heating and cooling system 10, CCHP system 20, CFB system 30, park wind power system 40, industrial park photovoltaic power generation system 50, and electric energy storage system 60. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0022] Example

[0023] See also Figure 1In this embodiment, a method for comprehensive energy utilization in a petrochemical industrial zone is provided, wherein the energy system includes a heating and cooling system 10, a CCHP system 20, a CFB system 30, a park wind power system 40, an industrial park photovoltaic power generation system 50, and an electric energy storage system 60;

[0024] The heating and cooling system 10 includes a heat pump system, an absorption refrigeration system, a petrochemical industry exhaust steam recovery pipeline, and a heating and cooling air intake pipeline;

[0025] The CCHP system 20 includes a gas turbine, a gas generator, a waste heat boiler, a back-pressure steam turbine, and an extraction industrial steam supply pipeline, as well as power generation and distribution lines and auxiliary steam pipelines to the CFB system 30;

[0026] The CFB system 30 includes a circulating fluidized bed boiler, an extraction back-pressure steam turbine, a steam turbine generator, and an extraction industrial steam supply pipeline, as well as power generation and distribution lines, and auxiliary steam pipelines to the CCHP system 20;

[0027] The park wind power system 40 includes wind turbines that are densely distributed throughout the park and are used to boost the voltage of power lines supplied to the park;

[0028] The industrial park photovoltaic power generation system 50 includes rooftop photovoltaic power generation in the petrochemical industrial park, coal shed photovoltaic power generation, and park lighting photovoltaic power generation, which is then rectified and boosted and connected to the park power supply system;

[0029] The electric energy storage system 60 includes a battery system, a power conversion system, a battery management system, and a monitoring system;

[0030] Heating and cooling system 10: During initial startup, because the petrochemical industry exhaust steam pipeline has no recyclable working fluid, the CCHP system 20 or CFB system 30 is used to generate steam to supply heat pumps and absorption chillers. When the petrochemical industry exhaust steam pipeline has recyclable working fluid, the system switches to the petrochemical industry exhaust steam pipeline. The heating and cooling system 10 provides heating, cooling, and air-conditioning water to enterprises in the industrial zone.

[0031] CCHP system 20: In the initial startup phase, when no petrochemical enterprises are producing combustible gas, external natural gas is used. When combustible gas is produced by petrochemical enterprises during the oil refining process, it is recovered, purified, and pressurized before being provided to the gas turbine for mixing and use. The generated electricity is then provided to the CFB system 30 for plant power consumption and power supply to relevant users in the park during the initial startup phase. The waste heat boiler generates steam that is used to generate electricity through a back-pressure turbine. The back-pressure unit extracts gas as industrial steam and also provides the initial steam source for the auxiliary steam pipeline of the CFB system 30.

[0032] CFB system 30: The circulating fluidized bed absorbs the combustibles produced in the park and burns them with coal to generate steam that drives an exhaust-type back-pressure steam turbine generator set, providing power to the park and a continuous supply of industrial steam for the petrochemical project.

[0033] Park wind power system 40: Based on the geographical location of the petrochemical industrial park, wind turbines are arranged to provide power to the park;

[0034] Photovoltaic power generation system 50 in industrial parks: photovoltaic panels are installed on the surfaces of park roofs, coal sheds, ash storage facilities, and other structures to provide power for the park;

[0035] Energy storage system 60: Used to shift electricity load peaks and valleys, storing wind and solar power and transferring it to other periods of time. This stabilizes the frequency of the park's power supply and improves the safe, efficient operation and lifespan of the park's power generation and power-consuming equipment. Specifically, the power plant charges the battery during periods of low load and releases the stored power during peak load periods. If the external power supply is lost, the energy storage system 60 can be used to achieve a black start.

[0036] Operation method: The EMC energy management system is used to perform comprehensive energy control on the park wind power system 40, the industrial park photovoltaic power generation system 50, the CCHP system 20, the CFB system 30 and the electric energy storage system 60. In the early stage, the park power supply is provided by the external power supply network or the park wind power system 40, the industrial park photovoltaic power generation system 50 and the electric energy storage system 60. After the CCHP system 20 is gradually started, it can provide the CFB system 30 with auxiliary steam for startup and the starting power required for startup, and provide a gas source for the petrochemical industry steam supply. After the heating and cooling system 10 and the CFB system 30 are started normally, steam is generated to supply steam and power to the petrochemical industry, while absorbing and consuming the combustibles generated by the petrochemical industry; the industrial exhaust steam generated by the petrochemical project is sent to the heating and cooling system 10 for heating and cooling to provide air-conditioning water for the park, and after cooling, it is sent to the chemical water production system for recycling.

[0037] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0038] Although the present invention has been disclosed above with reference to the embodiments, it is not intended to limit the scope of protection of the present invention. Any changes and modifications made by any technician familiar with the technology without departing from the concept and scope of the present invention should fall within the scope of protection of the present invention.

Claims

1. A method for comprehensive energy utilization in a petrochemical industrial zone, characterized by: The energy system includes a heating and cooling system (10), a CCHP system (20), a CFB system (30), a park wind power system (40), an industrial park photovoltaic power generation system (50), and an electric energy storage system (60); The heating and cooling system (10) includes a heat pump system, an absorption refrigeration system, a petrochemical industry exhaust steam recovery pipeline, and a heating and cooling air intake pipeline; The CCHP system (20) includes a gas turbine, a gas generator, a waste heat boiler, a back pressure steam turbine and an extraction industrial steam supply pipeline, as well as a power generation and distribution line and an auxiliary steam pipeline to the CFB system (30); The CFB system (30) includes a circulating fluidized bed boiler, an extraction back pressure steam turbine, a steam turbine generator and an extraction industrial steam supply pipeline, as well as a power generation and distribution line and an auxiliary steam pipeline to the CCHP system (20); The park wind power system (40) gathers multiple wind turbines arranged in the park and boosts the voltage to supply the power to the park's power supply line; The industrial park photovoltaic power generation system (50) connects the petrochemical industrial park roof photovoltaic, coal shed photovoltaic, and park lighting photovoltaic to the park power supply system after rectification and boosting; The electric energy storage system (60) includes a battery system, a power conversion system, a battery management system and a monitoring system; The heating and cooling system (10): in the initial startup phase, since the petrochemical industry exhaust steam pipeline has no recovered working fluid, the CCHP system (20) or the CFB system (30) is used to generate steam to provide to the heat pump and the absorption chiller. When the petrochemical industry exhaust steam pipeline has recovered working fluid, the heating and cooling system (10) is switched to the petrochemical industry exhaust steam pipeline to provide heating, cooling and air conditioning water for the industrial zone enterprises. The CCHP system (20): when no petrochemical enterprise produces combustible gas in the initial startup, it uses external natural gas. When the petrochemical enterprise produces combustible gas during the oil refining process, it is recovered, purified, and pressurized and then provided to the gas turbine for mixed use, and the generated electricity is provided to the CFB system (30) for plant power and power supply to relevant users in the park in the initial startup. The waste heat boiler generates steam and generates electricity through the back pressure turbine. The back pressure unit extracts gas as industrial steam and provides the initial steam source for the auxiliary steam pipeline of the CFB system (30). The CFB system (30): The circulating fluidized bed absorbs the combustibles generated in the park and burns them together with coal to generate steam to drive the exhaust-type back-pressure steam turbine generator set, thereby providing power for the park and providing a continuous supply of industrial steam for the petrochemical project; The park wind power system (40): wind turbines are arranged to provide power to the park as much as possible according to the geographical location of the petrochemical industrial park; The photovoltaic power generation system (50) of the industrial park: photovoltaic panels are laid according to the surface conditions of the park's construction objects to provide electricity for the park; The electric energy storage system (60) is used to achieve peak load shaving and valley filling of the electricity load, store the electricity generated by wind and solar power and then transfer it to other time periods, stabilize the frequency of power supply in the park, and improve the safe and efficient operation and life of the park's power generation and power equipment; That is, the power plant charges the battery during the off-peak period of electricity load and releases the stored electricity during the peak period of electricity load. When the external power supply is lost, the power storage system (60) is used to achieve a black start; Operation method: The park wind power system (40), the industrial park photovoltaic power generation system (50), the CCHP system (20), the CFB system (30) and the electric energy storage system (60) are respectively controlled by the EMC energy management system. In the early stage, the park power supply is provided by the external power supply network or the park wind power system (40), the industrial park photovoltaic power generation system (50) and the electric energy storage system (60). After the CCHP system (20) is gradually started, the auxiliary steam for starting and the starting power required for starting are provided to the CFB system (30), and the gas source is provided for the petrochemical industry steam supply. After the heating and cooling system (10) and the CFB system (30) are started normally, steam is generated to supply steam and power to the petrochemical industry, and at the same time, combustibles generated by petrochemical are absorbed and consumed; the industrial exhaust steam generated by the petrochemical project is sent to the heating and cooling system (10) for heating and cooling to provide air conditioning water for the park, and after cooling, it is sent to the chemical water system for recycling.

Images